Good game
The game is good, but I wish there was more strategy involved. The game pretty much comes down to luck and knowing which upgrades to get.
The only skill that's really needed is the last level. That level was great, but I guess I can see where its hard to design several levels like that that aren't beaten the same way.
I think what this game is a whole new mode added to it. Each level is two parts, the 2nd part is the same gameplay, but the better you do in the first part, the more easier the 2nd part is (like if are completely horrible on the first part the 2nd part is impossible, but the better you do the more super polygons added or something).
For example the first part could be an action mode where you control a small spaceship shooting these polygons. Your goal is to last as long as you can while destroying as much polygons you can.
Just a suggestion.