Is Continuum (previously known as subspace.) It's a 2d spaceship game, it has a great community, and large variety of game types (deathmatch, capture the flag, zombies, hockey, soccer, competitive leagues and more!) The best part is that it is Free and always will be. Give it a try! (requirements are low and the download is only 4.7 Mb)

to download: go to http://www.getcontinuum.com and click on download continuum or just go here for a direct download: http://www.subspacedownloads.com/download.php?fid=1335
here's a video (when you're playing it's fullscreen and much easier to see)
http://www.youtube.com/watch?v=vPnQMBv9paE

Already play this, it's really fun. I've been playing for 2.5 years now. It's INSANELY addictive. My alias is Seron, I play Hockey Zone.

Ah continuum, one of the best space shooters ive ever played, was great on my old acient computer.

is there any tutorial? for items and and which button is for what?^^

Press F2 or F1, forgot which. Arrow keys movement. Shift for booster. Ctrl for shooting primary. Tab for shooting bombs. Esc for menu.

Yeah just keep pressing F1 and you'll see the keys defs on the top left. Also if you enter SSCU Death Star Battle and type ?go tutorial (then press enter) you'll be taken to a very nice tutorial arena (SSCU Trench Wars, SSCU Chaos/League Zone SVS and SSCX Powerball are the best zones though IMHO.)

Holy damn, that looks interesting!!