I like the toybox aesthetic. The models fit the artstyle well
The jump is hard to gauge due to the camera perspective. It wasn't a huge issue since the game doesn't have that many tricky jumps.
The note properties/jump distance is only indicated by the color only. Which makes it hard for color-blind people. It'd be good to differentiate the notes visually on the ground and on trampolines.
The BGM is good but gets a bit repetitive over time.
I liked the different mechanics. In instrument that grew in size was pretty cool.
Overall, it's a solid entry.