First of all, bravo for making a 1Mb downloadable, the amount of ~500Mb archives on jams makes me sad. What engine/technology did you use?
The game is really fun, though I didn’t realize you’re supposed to reflect enemy bullets - I thought the player throws some kind of spears that are used to directly attack. Maybe add a quick how-to-play page to the game? Anyways, I enjoyed it, good job!