I don't think I'll finish all the monster levels. I'm good with puzzles where I can keep track of all the different permutations and it's very hard for me If every move I make almost irreversibly changes the elements of the level. The solution is too exact and one wrong step can mess you up.
That's not a criticism of puzzle design. My brain just doesn't work that way. I could eventually come to the solution, but it would require too much trial and error, and that's just no fun.
Thanks for the game!