A sugestion...
I loved the game, very simple, yet innovative at the same time.
I was wondering, in the sequel (If there is a sequel) if you could not only be able to choose from preset monsters, but also make-your-own-monsters as well, with no limitations whatsoever!
...Of course, if you choose custom, you can't submit high scores. Oh, well.
And perhaps a sandbox mode could suffice?
...just saying what's on my mind. Have a nice day.