This was fun. Maybe the most fun game I've played at this demo day. I enjoyed swapping between the two to solve puzzles, and I liked having an AI witch or AI knight to fight with me pairwise. It's a bit like a co-op game, but without the added duress of socializing.
Actually I quite like the colors. The green is a bit rich but it works well. You don't get to get a close look at the models, which might be your intention, but I would like to zoom in and see who the characters are.
I thought the demo intro message was charming and lovely.
It took me entirely too long realize that it is C to accept a menu option: nothing worked! not Z, X, Enter, Space, nothing! In the end I discovered it was C by just mashing my keyboard and hitting C by accident. You may want to allow Enter to let people open the Controls menu button.
I the menu animation and the level design. The monsters are cute and well thought out, but seem rather benign in that if you just run a bit they'll lose all interest in pursuit. So there isn't much suspense generated.
The music was not outstanding but it was not troublesome either.
Overall, I quite liked it. It seems quite far along, and I anticipate your imminent success.