This is awesome! I love puzzle games, this one was worth checking out, it uses the simple swap system, but it has a level design so well that it becomes unique, it has great art, and music that goes well together.
I only had simple bugs, involving the collisions of the two characters, I believe it's complicated to solve, but it didn't get in the way too much.
Another problem was the positioning of the characters (during the swap), I believe it is because it is programmed to store the position of the actors through "tile", I believe that changing it to "px" will solve it.