Nice concept! I was a bit worried in the beginning that I would instantly lose because I couldnt control the spinning, but the health was nicely balanced. After I got a couple upgrades the game quickly went out of hand I could just sit there AFK haha, but maybe thats the point? I think this could make for a cool idle game maybe even if thats a direction you've considered? Otherwise it would be nice with some way to control the rotation. Also, does a second explosive upgrade do anything? Would also be nice to see that healing costs some money!