FTL - This is basically a rogue like in space. You will die. Repeatedly. You goal is to get to the end of the sector. Each system you jump into will have an encounter of some kind. You have to wait until your engines recharge in order to jump again, all while fighting off an enemy ship. You have four crew members who can each die. You need them to repair the systems of your ship that can get damaged (weapons, sensors, engine, shields, oxygen generator).
You power generator only has so much power, so you'll have to micromanage your systems. Do you want to be able to power both your lasers and missiles? You might have to shut down your engines. This leads into the upgrade system. Each mission yields a currency in the form of scrap metal. This can be used to upgrade the various systems on your ship--stronger shields, faster engine recharge, more available energy from the reactor. Some planets have stores where you can buy new types of weapons or repair your hull, which does not regenerate.
As far as I know, the only demo is currently available through OnLive. It's worth checking out.