Fantastic experience, really loved how i kinda felt immersed even though my character was 2 pixels haha.
first boss was a good challenge, but I could not beat the second one, I might have gotten close though.
some hitboxes seem to be much larger than whats shown onscreen, or it at least feels that way.
Also i think have a health bar that has 2 distinct color, instead of red and pink would make it much easier to keep track of your hp.
Great work, really enjoyed it :D