What.
Enemies that break rules and inexplicably gain access to powerful weapons before you're allowed them do not entertainment make. I managed to make it to the ninth level, which proved to be bloody impossible, no matter how many times I attempted it, simply because those laser things are overpowered and there's no good reason you shouldn't be allowed them if the enemy has them.
Coupled with the fact that there's very little strategy involved, although the game was initially pretty fun and rewarding at that point it just turned into a boring routine of getting pasted, then doing a couple of rounds to get the money back to try again...
The game is well made, but ultimately it just made me amazingly frustrated.