Nice. Simple idea but you sold the fantasy of being one tower in a tower defence game. I played until some point the game just stopped spawning enemies :D
I kept clicking outside the game window on a 2-monitor setup. I think setting Cursor.Lockmode to something fixes an issue like this? Not sure but the solution for me was to just always turn left :D
Music fit the visual really well and the cannon was satisfying. Laser not as much tho.
Great job!