I'm with SnailSpace there. You made a really nice plot, the protagonist animations (even when he dies) are lovely and --important-- you remembered to put CHECKPOINTS in a really long level, thank god. I feel the need to praise you for that because so many participants overlooked that detail and left the player in an unforgiving one-hit death environment.
Some mechanical aspects though, could be better. For example, there is less room for player movement than it seems and the hitbox feels a bit awkward, I could barely dodge the cute bug/centipede/alien thingy. Does that make the game bad? By no means, but like, it clashes with the nice content you made. So if you're looking for further improvement, I'd say that's what you should aim for ;)