Very very cute and polished! Love what you've accomplished here and will be coming back to it. Smart how big you made the hitbox for mana collection.
I wanted to lean even heavier into "clicker game" with it and try to optimize my mana output, and this led me to research max speed first and end up with no mana and no slimes haha. Not sure if clicker game is the vibe you wanted, but with the time controls that's where it pushed me towards!
Great job.