A bit too difficult, maybe you can find a way to let the player be more in control, without changing radically the mechanics because it's fun. Maybe instead of rotating when shooting, constantly rotate?
I probably won't change how the player moves, as it's pretty core to the game. However, re-balancing enemy spawns is definitely a possibility. You actually have a lot of control over your ship after you get used to it, though there's a learning curve to it.
