The limitations of a four piece sliding block puzzle does limit the options and because the game had no in-game information about the controls for zooming out I was mainly just doing things at random and hoping for the best.
The lack of proper feedback made it so that only on the fifth level did I realize that I was collecting keys, I had though that the colored doors were suddenly opening due to a bug and I just though "Hey, if it works.".
Which is an indication of how stimulating the game was.
I think the concept could work if there were more pieces, challenging to design though as it would be.