Simple, but it's very fun, and I specially like the little animations and music even as simple as they are.
There's not much space to actually use the dash tho, I assumed you'd be invincible during it, but I discovered the contrary by the worst mean possible lol. So yeah, dash is kinda useless, wich is sad because it is the one move that has an actual nice feeling to it.
Also, space bar is a very weird choice for shooting button, you could've either put it on S instead to be right alongside dash's D, or on the right mouse button since you're already aiming with it anyway.