I really like the presentation here! The art is very nice and I enjoy the gameboy style colour palette. The music and sound effects are great too. Having a introductory cutscene is a cool touch as well, though I wish it could be skipped after you die.
Unfortunately, I'm a bit stuck. I got the double jump on the left, then went right and found what looks like a trophy and shield. I'm not sure how to use them or what to do next. The only other place to go is this gap in the starting room, but that seems to be too big to get across with just the double jump. Am I missing something?