My favorite ones are as follows:
1. Jetpack Joyride.
2. Dungeon Raid.
3. roll.ball.jump
4. Canabalt.
5. Boost 2.
I like games that keep going for ever trying to beat your previous score. - Jetpack, roll.ball.jump, Canabalt, and Boost 2 are favorites.
I wonder myself what other gamers like in this genre of games.
Thanks,
Doron