Amazing amount of effort put into this. Great visuals and audio. Like others, I found the menus slightly frustrating. The progression did also feel a bit slow; I expected to feel "powerful", but never really did (admittedly I don't have much experience with this type of game). It also wasn't obvious what impact the upgrade tree was having on the gameplay (I bought a bunch of upgrades but didn't really "feel" them). I played for quite a while though and unlocked all of the top row of weapons. Really nice work!