Pretty fun game. I love the pulse cannon mechanic, it's simple but also really fun and allows for some interesting gameplay. I do wish there was more because I would've like to play more levels with the cannon jump, but I understand that it's just a demo.
The camera definitely needs some work, it feels like it's way too high up so it's hard to see below me. The controls could also be a little snappier, sometimes they don't feel precise so I end up making a bunch of accidental movements that make me fall to my death. I would also add in a small sound effect or a clear visual indicator for when the cannon finishes charging so that I don't accidentally release it too early.
Nice game overall! I made it to the end and had fun playing the game.