Fun short game, the concept is surely interesting and would allow for interesting puzzles if developed further: for now, the three levels are very simple and the game doesn’t overstay its welcome, so good job on that! ^-^
The visuals are simple but quite nice, and same goes the sound design. Controls-wise it gets the job done, though there are some problems with collision detection: if you keep pressing an arrow button while against a wall the character keeps compenetrating it and getting pushed away, even when not touching the ground (if I understand correctly it is because of your use of transform.Translate for movement, using Rigidbodies or checking if touching a wall with a Raycast will probably fix the issue).
Had a fun time overall and the twist in the third level was pretty unexpected, so keep it up!