This has been one of my favorites so far. Really impressed that y'all made the art during the game jam. Very cheeky ;)
I enjoyed the later levels with the math the most. Having to think about not just the amount of pickups but the numbers and negative numbers was great.
If I had to give any constructive criticism I'd say a couple of the simpler levels were maybe too simple. But they also still serve a purpose, by teaching the mechanics, but I think you could teach those mechanics while still having slightly more involved puzzles.
Great job!