Huge bug: The achievements do not give the proper amount of gems. I only noticed this specifically on the "Cast 75 powers" achievement, but the bug most likely affects other achievements. When I fulfilled the conditions, I only received one gem, instead of the proper two gems which I should have received.
I keep coming back to this game again and again. I've gotten all but one achievement before, and now I'm back playing it again, with a wiped save file because I'm on a different computer. Even without badges, this game is totally worth playing, because of it's excellent theme of the boss learning to fight against you. I remember playing this game when it first came out, and three and a half years later, it's still awesome.
The rocket launcher leader is horrid in the final battle.
Also, the "walk x meters in one game is misleading, and it actually just measures how long the game has been going on. So using things that increase your move speed only count based on time, not distance.
I glitched the game making it impossible to get out. I got both white and black guns, but I went through the red blocks towards the path to the Sun Boots. I got the boots, when i got back out I couldn't traverse the red blocks again, so I was stuck.
Decent game, but not enough puzzle, seems more like just luck. Additionally, making level 21 only available on bored.com seems like a pretty dick move...
Maybe give some points over time that allow you to unlock new things; they could be simple changes that evolve into much more as the game goes on. Possibly a different "color" of people, representing different tribes. Over time, tribes become nations, with a chance to become belligerent and a chance to be peaceful. (Or... with 3 or more nations... war alliances.)