Well done! A very solid game and well polished. I am impressed with how much you were able to get in.
I think it would be nice to have a little better indication of where slime direction post transformation would be helpful. I'd figure out how to complete the level, but I'd have to restart 3 or 4 times to get them positioned just right or time the transformation just right in order to get all 3 gems.
Other than that, really well done! Thanks for the submission, I had a good time playing it.