ThreadSpace: Hyperbol is fast paced 2D but 3D viewed action-strategy game set in space, in the distant future. Its focus is online play, with deeply emergent gameplay from many tactical options.
Players control a highly customizable gunship, and fight alongside teammates in a persistant world. Ships are customized, colored, renamed, personalized, and upgraded by players between matches. There are stats, leaderboards, online rankings, and a sector to take over by your faction.
It is available via Steam in both Retail and Demo. The Demo gives 4 internet play hours, as well as unlimited LAN and solo play. On top of that, every Saturday between 2pm and 4pm PST, play is free for demo regardless of expiration.
Every saturday, during a time block known as Hyper Hour, play is completely free, no matter if you have the demo version or the full, so even if you don't want to shell out the measly 8-9 bucks for it, you can still play for free online during that time. LAN play is free forever, and its a great LAN party game. Single player (botmatch) is also free.
Installs via steam without issue.
The developers actively encourage WINE use and have made alterations to the app to better support it. They have published steps to get it working http://wiki.hyperbol.com
although the latest versions of WINE seem to make this pointless as it often just works.