Airplane War Thing

Music: Nintendo Kirby Gourmet Race
If the bullets are slowish its lag.

The goal is to survive, not destroying all the airplanes, though that does give lots of money. 

Don't crash into planes or the explosions from their destruction. 

Only levels 1-10 are functional. 
If level 8 keeps glitching on you; fix your internet. If you can't just wait it out, leave your computer running. If you don't have time and just want to try the last two levels, restart the program, and hit "c" to set your level to 8 and to get you 500 coins for the next plane. That eliminates most lag.

Enemies get stronger after each boss.

This is very beatable, me and several others beat it.