It always helps to include a little readme with the controls, although it wasn't so bad here. Futzing yielded results. Got that message on how to resize the window, unlike our friend down below.
This is a pretty brutal bossrush game you've got on your hands, not a bad time at all. Pretty up there with the Ys games. The chunkier artstyle works well with the game, and completely unrelated to anything at all, Yancy is a pretty good name for a protagonist.