Very fun game!
It has an intuitive control system and feels very natural. The goal can be quite confusing at first but you'll figure it out quite quickly. It's also a very beautiful game, both visually and acoustically.
Here are some features that could be quite fun (Just the obvious stuff):
-More levels
-Level editor
-competitive multiplayer
But still, it has some replayability: Speedruns and no-death runs can be quite challenging.
all in all: 10/10