A simple concept, but it's not a bad thing. The projectiles don't travel too far before disappearing, making you need to move a lot. This makes the game super hard because instead of firing a gun you essentially have a sword and need to move closer to the enemies. I would also add some music for some feeling of more action.
Overall I enjoyed it. I think it's a great base for a nice short game. I would also appreciate if you could rate my project :)