A bit visually overwhelming. Between the lack of full-screen, the filter and how small the spikes were I often found myself jumping right into spikes because I didn't see them until it was too late. I don't know if all three of these issues need to be fixed but even just making the spikes a bit bigger/more noticeable would go a long way.
Also, I'm not sure if it was intentional, but the music made me feel uneasy as I played. I kept feeling like something was going to come out of no where to jump scare me. I get the feeling that might be more tied to my personal tastes than something wrong with the game.