This is a very decent platformer, it's clear that you've put a lot of thought into level design, you can always see where the spikes are, I knew what I did wrong every time I died, so great job on that part. I do think you need some checkpoints in the game, starting from the beginning after making a small mistake can make a lot of players frustrated (this is very important). Overall you did a great job with this platformer, well done!