I love the concept of your game, it has a great potential! The major problem I have with it is that you can only hit in the direction you're moving to, making it impossible to kite back the foes, which is something that makes waaaay to hard. But I'm pretty sure that with "Isaac like" controls (movements and aim differanciated), the game can be pure fun!
I still enjoyed testing it though, you did a very good job, gg!