Not much to comment on here. The items you have implemented so far are interesting and fun to play around with. I understand this is a demo, but this is quite short. I wish the enemies respawned on a timer or something so I could play around a bit more. I was also able to jump out of the player's spawn area (the area with the controls) and fall off the map.
It would be nice if I could bring the camera farther down toward the ground. Looks promising so far.