Well, I have faved 253 games in AG, but I'll list a few of them here, in alphabetical order, and how much I'd rate them from 0 to 10:
1) 400 Years - A very simple (but cool) game. 8.5/10
2) Age of War (1 and 2) - These are some of AG's very classic ones! 9/10
3) Antichromatic - A very, very hard platform game, almost as hard as Give Up 2. 7.8/10
4) Cactus McCoy (1 and 2) - This game is very nice, and I had A LOT of fun when I was beating them to 100% 9.2/10
5) Diamond Hollow (I and II) - It seems these games aren't very known in AG, but they ARE worth it! 9.3/10
6) Epic Battle Fantasy (all the four games, but mostly III and IV) - In my opinion, they are the best RPGs EVER! (and also, the music is insanely good) 9.6/10
7) GemCraft (ALL of them, but mostly Labyrinth and Chasing Shadows) - These games are very well-made tower defenses, and I'd say that upgrading gems rather than towers is very original. 9.7/10
8) I Saw Her Standing There (this, and both of its sequels) - Quite simple and rather easy and short, but they are very nice 9/10
9) Into Space (all the 3 games) - These arcade games are quite good! 9.1/10
10) Kingdom Rush (both games) - Well, these tower defense games are just awesome. There is a reason why they were the highest rated games in AG for so many years. 9.6/10
11) Obliterate Everything (both) - A strategy game about war in space. 8.9/10
12) Raze (all the 3 games) - I'm usually not into Shooting games, but I still liked this one; It's worth it. 9/10
13) SHIFT (all the games) - This is a classic puzzle/platform game. Very awesome ones! 9.1/10
So, for now that's it