We'll be releasing the game on Windows, Mac, and Linux on Steam.
If Steam's not your thing, you'll also get a direct download.
Through Steam, we hope to release all of the Early Access versions simultaneously (Windows/Mac/Linux) around August 2015.
If something prevents us from doing that, we'll be sure to let everyone know.
Yes! Any tier at or above $25 will net you the extra copy of Orion Trail and our two other games, Enemy Mind and Innercube.
Don't see the answer to your question? Ask the project creator directly.