Fun game! I had a great time playing it!
I think this game could definitely use some ledge forgiveness, where if you press jump the moment after you leave a ledge, it still jumps anyway.
Also, not having checkpoints was really frustrating. I can understand having one-hit death, to make the game unforgiving, but once I've successfully completed an area, it kinda sucks to complete it again, haha.
I really loved the lighting effects!
All in all, really fun. Nice job!