This is awesome =D
Everyone who says this is hard, try for more than 5 minutes, you fuckin' pussies.
Also, seriously guys, he pretty clearly says that to switch weapons, you press 1-6 in-battle.
1 - basic cannon
2 - chain gun
3 - rail gun
And so on. Come ON, it wasn't that hard to figure out, and that way, you can go from one weapon to the next in the middle of a battle if your weapon overheats and you don't wanna wait for it to cool.
The only negative thing I have to say is that the numbers are kinda hard on the eyes sometimes. Other than that, this is fun shit, kept me busy for a good hour or so maxing everything out. Keep it up, this is quality.