Yeah.... my original idea was going to actually be far more similar to yours... I wanted to add in some more dance based abilities but animation is hard! (So props again for such great dance animation in your entry) , and one I started sprite drawing it kind of took it's own direction. The engine actually dates back to the MVM before that (14)... There is a borderline unplayable MVM14 entry called Partial Vanya in which the majority of the engine development occured.
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Oh man, I agree on animating dances. The thriller dance took forever for me, but I was laughing the entire time so it was still pretty great. I actually expected some awesome dances when I saw your entry. And its not just the character art that really impresses me. The detail you put into the background of rooms is great. Loved the bathroom haha.
I'm definitely not skilled enough to build my own engine so more props for that. But its been really cool seeing yours evolve. I feel like movement and collisions have definitely improved each time.