The visuals are very nice and the game is indeed chill! Good job on that aspect!
The game is pretty short, but that's understandable. Only thing that threw me off is the sound effect for when you go in a direction you can't, it's a bit too loud for my taste and maybe should trigger a bit lighter when the second cube actually makes a correct move.
Unfortunately I can't rate high on the theme category as it doesn't fit for me. If the cubes could help each other in someway it would make more sense but for now there isn't much of a necessity and just a requirement in the form of grass tiles.
Anyway, Great job on the graphics, the audio, and the enjoyable game!