The stacked monsters were supposed to work that way, but since I think no one actually likes them this way (not even me) I'll make it so they all fall when there's nothing below them. With the art revamp I'll fix the platforming issues, and try to make the level design a bit more obvious too.
Button combos seem like a great idea that will make the game less clunky. I'll play with it a bit and see if I can get it to work.
Thanks for taking your time playing and reviewing the demo, the ideas you posted WILL make a difference!