The poor performance and very low resolution made it very difficult to see anything; I can rarely see the enemies or attacks. Jumping/falling is too fast to control while other aspects feel sluggish. Controls were also really oddly mapped (I used a gamepad), and I couldn't find the option to unbind controls, so I had to play with dodge and interact bound to the same button. Can't say I felt very satisfied when I won. The overall presentation of the game, however, was really good, the art and music were nice. The game itself definitely could be better in terms of performance, visibility, and mobility.
Edit: Latest update fixed most of my issues! Now all it needs is a full screen mode.