Nice work, and cute art! I agree with others that the camera controls should be adjusted -- I'd probably have the camera rotate only around the Y-axis, keeping the X-axis locked or at least damped? Not super often you need to be looking directly downwards, or perfectly parallel with the ground.
A simple adjustment to make the gameplay loop more solid might be to have the each weapon grow stronger for each time you span the wheel before getting it. These upgrade point could be 'banked' so that even if you get three bad spins in a row, you know that when you do land on a weapon, all those points will all get dumped into it, and that weapon is going to grow by 3 tiers at once ! Very satisfying. This way, you're encouraged spin the wheel so that your weapons scale to keep up with enemies, but you're also forced to learn the particular playstyle demanded by each weapon. Just an idea!
Good stuff!