Probably said before but I will say it anyway: Make the tutorials go away once you saw them! It's anoying and break my concentration everytime they pop up
For people complaining about lack of strategy need, I guess it's because we are playing against AI anyways. If there were at least a 3+ players FFA and/or Multiplayer mode, it would require a little more strategy to beat the game.
I used Rajei's build for a while, but the regeneration won't be enough from lvl 25+.
Even the red power up's won't be enough, so you should go first for rapid fire/fire spread and then pierce. After that you can choose between pixel drop or pixel magnet, because you regeneration will be lvling up. You can also put 1 or 2 points in regeneration, but then again, it will heal so slow that you will eventually die. For critical, I really don't know how many points you should put it, or when. It is very useful, but I still don't know if Critical > Magnet/Pixel drop.
Awww! This game sucks! It has bad controls, bad graphics, bad music, it completely sucks! C'mon, it's so unreal! What kinda of human would die like 9 TIMES?! And I mean, what the hell in the ending?! 1/5, IT COMPLETELY SUCKS!!!