Great puzzle game! Didn't play all of the levels for the sake of time (1-9 then took a peek at 15) but these are some great puzzles that really got my brain working lol The main critique I could give is maybe have a way to get to the higher levels of slimes faster. While some puzzles work really welly going up the whole series, I could see some puzzles getting a bit tedious as you have to make more and more of the higher levels. So maybe some plus squares give a higher level slime, but you could add an X square nearby to make it a bit harder to use.