Great level design and fun (and a little rage inducing) to play. Made it through til the end. I liked how far you could jump if you held space, it made for some cool level design that wouldn't been possible otherwise, and since you have the variable jump it didn't feel floaty. Three things I wished improved was:
1. Make the respawn a bit quicker
2. A little flash or something to let you know that the laser is turning on again (like 0.5s before it starts killing you)
3. Make it so if you are standing still on a button the laser doesn't reactivate (currently you have to exit and reenter it for it to not start again, which is completely understandable from a programming perspective, but it felt illogical in game)