The only complaint I have with this game is that you have a limited number of adventures... Why do I have to wait an hour to play more? If the developpers want me to play, I should be able to play as much as I want...
If you are looking to get the "Apocalypse then" badge (pixel pack), here's a little tip : get enough DNA to upgrade your speed once, and it will become a lot easier! You can even upgrade your other stats too so it becomes even easier, bbut remember that speed is the most important. Hope that helped :D
I think Kongregate should add a hard achievement where you have to beat the game on xtreme mode without activating any other cheats. I tried it and it's tough!