Really great demo. I started watching PHI's video on it and as soon as the seed dropped I stopped watching to go and play it myself. Definitely did not disappoint and I'm looking forward to what you do with the concept, especially since I'm currently working on something very similar.
I did manage to stumble on a firing bug (maybe you know about it already) when I forgot I could jump on the 2nd or 3rd screen. Demonstration is here with some additional info.