I feel like genius ;P MAKE MORE!!!!! BIGGGER!!! HARDER!!!! LONGER!!! and it will be perfect ^^ I've just imagined full screeen version... 5! 5! 5!!!!!!!
HINT for level 15: fully upgrade SAW and LIGHTNING, 4 upgrades in TOWER UPGRADES, the rest of upgrade points - as You like, from the bottom: Heavygun, lightning, maschinegun, saw, lightning; choose all the upgrades, which make more damage, steam strike might help, but it's not necassary
Burrito Geek challange: not only a meteor! try to reach possibly high speed, and You can break firt wall with a speed over 200, second 300 (maybe even less) and 400 is enough for the last - it's easy to get, when You launch geek horizontally with max speed and push him again fast - with a bit of luck you can get the achivement quickly
Thank you very much!