Ok! This one is amazing!
It took a short while to figure out exactly what to do.
I didn't realise you could scroll the screen, and wasn't sure how blood works. It also took a moment to figure out that the skeletons were friendly.
It seems no enemies spawned on my second attempt.
But it's satisfying to figure out, then really fun to play!
In fact; in a way, I think the ambiguity actually helps to make the game more satisfying. It's really cool!