can't fire turret. beam works.
Click and hold your left mouse button to shoot turret.
Feels a bit strange, maybe make it jerk in a direction when hits an object and rotate in the direction it is moving.
I didn't get very far so there may be more surprises in later levels, but as far as side scrolling shooters go it holds its own.
I like that you can aim with mouse, something side scrollers like this usually don't have.
Graphics could be improved.