Unknown Worlds has announced that Natural Selection 2 is now available to pre-order on Steam, marking a massive point in their long development cycle after months of beta-testing, asset-teasing and what we can only assume would be copious amounts of blood, sweat and tears.

"This day is one we have looked forward to for many years, and marks a major milestone in the development of this game," the team wrote on their official site. "We are also happy to announce a release month: October. As we clear some final hurdles over the next few weeks, we will nail that down to a specific day."

The team are offering both a Standard and Deluxe version of the game for pre-order, with the Standard edition coming in at only USD$24.99 which will give you the game, while the Deluxe edition will set you back USD$39.99 and features:

• NS2 Official Soundtrack (almost 1 hour of music)
  
• Digital Art Book (40 pages)
  
• Exclusive wallpapers and avatars
  
• Exclusive new in-game marine armor

But that's not all, the team also have more love for their fans, pledging that anyone who pre-ordered the game before today's Steam sale or anyone who played in the Beta will get the following:

• A free upgrade to the Deluxe Edition detailed above
  
• A free copy of NS2 Standard Edition to give to a friend or stroke lovingly
  
• Continued private beta access right up to launch day in October

They've also said that from today until the actual release day of the game, the Deluxe edition will be discounted to USD$24.99. Not bad for an indie team.

Click here to get your Steam pre-ordering on.