Would be better if the camera didn't move EVERY time you fire a shot. And when clicking a weapon it stays on that weapon so you dont need to click it again once it's reloaded. 3/5
$ out of 5 from me. Would be even better if you could upgrade the ships health,armour etc.
.If using big laser try to get enemys in a straight line so they can all be destroyed at once.
.If using BFG fire it at a corner to the opposite corner (bottom left to top right kinda thing) then move with the ball while shooting other enemys.
Lil tips:
.when using the BFG you can go inside of it, while still being to fire other weapons, it will act like a shield untill it goes away of course. But it doesnt protect you from enemy fire.
.If the next level has loads of enemys then expect them to be medium/weak ones. Use a large range weapon like big laser.