Spheroids is another cool space themed shooting game where you control a sphere and battle against other players. There are moons scattered around which you can destroy in order to gain orange essence which charges your power up. Beware the blackholes however as they can really ruin your day!
Use the space bar in order to thrust in the direction of your mouse, use W to shoot and Q to use a power up once your bar is fully charged.
Travel around space in true zero gravity like fashion, a small amount of boost can go a long way, possibly a bit too long as you can reach high speeds in no time making your sphere hard to control. The moons seem to have their own gravitational pull which can be used to stop your sphere and make it easy to shoot one target without flying off.