Having been an avid gamer on the IPod Touch, I've grown quite familiar with many of the genres, titles, and producers of even the most unsuccessful IPod and IPhone video games. But without talking about each and every one, I'm here to share with you the best part of my experience, the good stuff.
Here is the list of games I consider MUST-HAVE-PLAYED on the IPhone/Touch in the order I remember them:
Tap Tap Revenge 1,2,3 / Rock Band

Tap Tap Revenge is a popular "mock" of the old online game Flash Flash Revolution and the classic Dance Dance revolution. Except instead of using arrows that are pointed in four different directions, you are now trying to hit 'dots' that come down in three columns, making the game-play slightly easier than that of Rock Band's on the toughest difficulty. If you have not played Tap Tap or Rock Band, it is strongly recommended that you do, because they are highly addicting when you first start.
Galcon / Galcon Labs
Galcon and Galcon Labs are two games in the same franchise that offer slightly different variations in game-play depending on which one you have. Generally, Galcon and Galcon labs are pretty much real time strategy games winded up a notch. At the beginning of every game, the user starts with a set amount of forces or 'ships' and a home base. Your enemy, depending on the difficulty, also starts with a variable number of ships and a home base that is relatively far from yours. Every second, you will gain troops on each of the bases or 'planets' that you own on the map depending on the size of the planet, and likewise, so will your opponent.
The object of the game is to take over planets in the available map and essentially annihilate your enemy's forces completely. Despite how strategic it may seem, this game is rather quite simple to get the hang of and quite difficult to let go.
IShoot/Pocket Tanks

There isn't too much of a difference between the two games. IShoot has a generally brighter setting and a more humorous game-play due to the cheesy dialogues between the CPU players. Despite IShoot's weapon creation function, Pocket Tanks has a MUCH greater variety of weapons to choose from and a much larger spectrum of attacks which really makes the game more dynamic.
Plants VS Zombies

Cartoon Wars/ Xeno Wars

Xeno Wars, which I consider the more advanced of the two games, even incorporates a Bejewled aspect into the money-making aspect of the game which makes it a truly amazing fusion game experience.
N.O.V.A

Assassin's Creed - Altair's Cronicles / Dungeon Hunter


I'm sure many of you have heard of Assasin's Creed, the IPod game does not disappoint. However, please note that there is no free-roaming and exploring allowed in the IPod version because of memory problems, but that doesn't take anything away from the great storyline and beautiful graphics. Dungeon Hunter is another very well made RPG with great graphics. Although slightly restricting in terms of character personalization, Dungeon Hunter compensates the conservatism with many maps and a very long story line.
Sword&Poker

This game came out of nowhere as a surprise when I was browsing aimlessly for apps. And I must say, this is one of the best games I've played on the IPod touch interface. With an ingenious combination of strategy and role-playing, Sword&Poker fuses the fantastic western Poker game with a very Anime-styled combat and fighting system.
Geo Defense / Geo Defense Swarm

Your typical tower defense games. Geo Defense really stand out though, in the fact that they utilized and pre-thought out every possible aspect to make it a good game. The details are so astonishing that even the enemy explosion pixels may be absorbed by certain towers and used to attack. The graphics are also quite flashy and 'cool' to watch. ;)
Papi Jump / Doodle Jump

Full of awesomeness. Papi Jump, the grand daddy of em all, is probably the first game that utilized the accelerometer to its fullest. Doodle Jump seems like an upgraded and more challenging version with many more pick-ups and random occurences that really give the game a twist.
Tilt to Live

Probably one of the most innovative and addictive games on the hand-held market. Graphically, there is nothing to be proud of in this game. Neither are there anything special in the music nor plot. This game is just a game of pure awesomeness. By utilizing the accelerometer like a sensor, the player controls an arrow that moves as you tilt your device. As time passes by, 'dots' will appear and start chasing after your arrow. If any of the dots touch your arrow, you lose. There are weapons that float around on the game boards that you may use to destroy dots with, and as you progress, you will unlock new and more powerful weapons.
Asphalt 5 / Real Racing


That's right, its racing time! These two are the best racing game out there on the IPod. No contest. Both of which have stunning graphics, amazing soundtracks, and jaw-dropping game-play and visualizations. Asphalt 5 is slightly less realistic but much more exhilarating to play in my opinion. While Real Racing is very... Real. And I mean... VERY. The feeling of using the accelerometer with Real Racing feels almost as realistic as being in the driver seat of an actual car.
Hotel Tycoon / Air Tycoon


The classic tycoon games, rendered to perfection on the IPOD. Start a business, get rich, and annihilate your competition.
Lux Touch

Red Alert 2 / Lost Empires

These two here are your favorite real-time-strategy games on the IPod. Red Alert 2 is actually quite popular on the computer as a world-wide RTS and the hand-held version is an excellent adaptation. Lost Empires is also very well made. The latter takes place in medival times, much like a good ol' game of Ages of Empires.
Chaos Rings

Before we begin talking about this game, I would like to give Square Enix my utmost praise. As many of you out there who played the final fantasy out there, you'd know I'm not lying when I say they were CRAP. Square Enix went beyond the normal comprehension of IPod capabilities and created a game comparable with that of an early PS2 game. Chaos Rings, inspired by video game legacy Final Fantasy, offers the same--if not even deeper-- complexion in its game-play and story progression.The amount of satisfaction and nostalgic feeling this game offers is beyond a simple description here.
Pocket Gamer Review Quotes:
"Graphically Chaos Rings really impresses. Beautifully illustrated 2D backgrounds make up the environments, while characters and monsters consist of detailed 3D models. It has a look that's evocative of classic Playstation-era RPGs. The battle sequences are fully rendered in 3D and really showcase the gorgeous enemy designs and fluid animations. The huge bosses in particular are downright intimidating as they fill your touch screen with their presence. A dramatic soundtrack accompanies the action and provides a unique sound for each of the locations in the game."
See for yourself: