Great game, the mechanics felt great, which can be challenging when you have physics-based movements, like the spinning.
What I enjoyed the most, were the weapon's combinations you could do. It was a great design choice to have weapons act as 'power-ups', adds depth to the loadout.
If you're thinking to expand on this game, the biggest risk I see, is the spinning mechanic becoming repetitive pretty soon. In my case, after 4 to 5 levels, started to feel repetitive, and I could predict enemies movement patterns.