This could really shine as a nice lil puzzle game - though there ae a few rough edges, such as cubes not triggering exit buttons, or being able to be soft-locked in the second to last "elevator shaft" style chamber.
Mechanically the gameplay is simple, but for a puzzle game, that's a good fit - simple with depth is better than shallow complexity, and I feel like this game has the potential to be a fun little puzzle experience with the right refinement.