Neat work! The art's great and the concept works too, wasn't expecting the ending XD but, it ended faster than I expected. I will say I didn't realize there was a world boundary when I was avoiding the enemies, so it might be worth putting in an indicator for it possibly. The game itself is very simple and lends itself to easy play so great job on finishing it up!
Last thing I wanna add is, I love the foreshadowing in the literal shadow of the title screen XD. Amazing job!