Hi!
It's a pretty nice game. The concept is pretty nice
It was a little tough for me in the beginning because i didn't know the enemies were hidden and kept dying. You could add a trigger to restart the level when the player falls, otherwise people would have to start from the beginning. I also could center the game at the players position instead of left or right because it made shooting difficult in the 4th level with all the diagonal going areas.
Overall, it was nice, you could polish it further and it would become a great game