(Failed to post on the love2d forum so I'm putting it here)
It's really rough around the edges but I think you did a great job dude for your first game! I would suggest a larger, more visible health display. Maybe a bar or a different color. It's also pretty fast paced and difficult to tell if you're moving away until an enemy pops onto screen. I would suggest some meteors or stationary objects to help visualize movement. Overall, congratulations on your first game!