Unique take on a win condition, I like it. Got to wave 5 and got absolutely destroyed :(
Does the direction of the spinner change with your mouse delta instead of position? By the end my hand moved on its own and could control the spinner quite well but it was hurting my brain. I'm very curious as to why you decided to go in that direction. It's a very unique control scheme.
A small issue the game has is that the emission of the centre area (the one you have to capture) hides the direction arrow of your spinner, making it very difficult to aim when it matters most.
I would be happy with the game, it's a finished experience with gameplay that feels good and done by a solo dev in a week. Good job.