I think this game has a great level design and some unique ideas. Unfortunately I feel it falls into a trap that a lot of "sokoban" (is this a sokoban game??) style games fall into, and thats that actually preforming the solution is more tedious than finding the solution itself. What I mean by that, is that even though I know for a fact what I'm supposed to be doing, it still takes a loooong time to do. This is made even worse by the fact that a single wrong input, or a double tab of the spacebar, can force a level restart.
The two main ways to fix this would be to removed the "confirm input" style of gameplay, and just have me move these characters on a grid, and to compensate for the additional input mistakes that I would make, add in the ability to undo individual moves, a-la Baba is You, or Stephan's Sausage Roll (Two great games to look into if you wanna study puzzle design!)