Very nice! loved the art and gameplay style here. Use of sound effects were also a great touch!
I found some of the platforming on the 3rd level to be a tad tricky. Mainly because of the rounded corners on the platforms when it seemed you had to make pixel perfect-ish jumps. Only other issue I had was the game just didn't seem to run at 4K at all (not entirely sure why!) but worked as soon as I changed my monitor resolution.
Overall this was a great SBIGJam entry! Well done on completing your first game!