Hello! I really love the colours and sound and atmosphere of this game wow is it beautiful! Of course I'm sure you're already aware of the small bugs in your movement but it's completely understandable due to time constraints etc.
One simple band-aid solution you can add however is a quit level reset button if you want to make a small patch update. My browsers a bit slow so I die a little every time I reload the game, however I love simple little platforming games if done right and I personally enjoy the first few levels you've made.
Kind of funny how such a peaceful atmosphere turns bloody red when I get stuck in the wall after failing a jump for the 10th time but oh wells, I look forward to seeing more from you!