I won! :)

I really like the visual style. The screen shake was really fun at first, but then got a little bit too much when it turned out to be on all them time. Otherwise it feels really coherent. I like the level up text and the particle effects.

The menus looked really nice as well.

As for gameplay, the game felt good, but it was a bit monotoneuous (and maybe a bit too easy?). I wish the upgrades felt more like upgrades. It was hard to say exactly what they did. Maybe bigger jumps between upgrades and faster increase in enemy strength would solve it.

Otherwise, quite fun.

EDIT: Oh and also how the money worked and whant the -$ and $ meant wasn't soo easy too figure out. Maybe add a help text the first time?

See me play your game here: https://youtube.com/watch?v=vjntHAB6-Zs

I agree with most of what johan said, except that I did not win XD