If you fullscreen the window, the upscaling that is done by the engine anti-aliases the render, making it very blurry.
Additionally the Amazing Ghost text on the title screen seems to be drawn to the 320x288 upscaled window as if that was the screen size, rather than drawn to a 160x144 window and upscaled later. Once you enter the gameplay, though, everything is the right scale.
Taking corners is very unforgiving, and the moving enemies will get you if you get stuck even briefly on a corner, making for a frustrating experience. With some forgiveness on those corners, it becomes a fairly enjoyable little game. It combines the puzzle solving of figuring out where you can reach to open up another section with the reflexive play to avoid the moving enemies.
The controls on the page mentioned something about shooting black crystals? I didn't go particularly far, but I didn't seem to fire anything when pressing the specified key. I'm guessing that wasn't implemented in time for the jam?