Very cool! Love the mechanic doing 2 things at once and that its so physics driven -m y only issue was the yoyo wouldnt rewind super well? maybe there is a timer but it wasnt clear why it wasnt rewinding sometimes. I also think the structure you have gone for - waves and upgrades is a perfect match for this game
I think there's potential for something cool here, I'm just calling out a few things I think can help if you were to work on this further
- Cleaning up the environment a bit, so enemies and the player stand out more
- Having enemies spawn in always at a minimum distance around the player, I sometimes had people spawn on the location I was at
- Add a line to the yoyo so its visual where it is when it goes off screen
- Feedback and effects to enemy spawning, dying, rewinding the yoyo
- Maybe the yoyo can have physics and collider with obstacles in the real world ? Maybe this also spins you around? Something to explore
I had fun and see potential for something bigger here so I wanted to make sure you knew!