Ok, I had so much trouble making this game work, please, next time upload a downloadable version, neither one of my browsers would let me play this game, two wouldn't load and one loaded, but the game was 1 fps. I had to download your guys source code and run on the engine directly.
But now, the game is pretty fun, it a simple and fun shooter, I thought it was weird seeing a cylinder attack me, but it was pretty funny. The upgrades are cool, but need more variety, I personally didn't use any melee attacks, they felt kinda useless. The level design was cool, the art and sound were good as well. I thought it was a bit easy, maybe it was because I was playing in the editor and I feel I didn't took any damage...
Regardless, the game is pretty fun, I believe with more stuff, polish, it has a potential to be very good fun!!