Short, but sweet. The game honestly left me wanting for more. Really nice throw back to classic rails shooters, especially given the pixel shader. It was a lot of fun. You could try releasing something like this on mobiles.
In terms of improvements, I think its length is the main one. That's something you'd want to fix post-jam, if you feel like it. It also did seem too easy, which can hinder the replayability aspect. So, you might want to tweak the difficulty a bit.
As a very minor issue, I think you should have picked a different title.