I did submit a demo to Steam at the same time, but it appears to be inaccessible. You can grab it directly from the Windows icon of my own website:
http://mdickie.com/games_unity.htm
It is strongly recommended that you do so before buying the full game, as I'm hearing that it does not run at the intended speed on all specs. I am not yet able to replicate the issue on any PC I own, but I hope a universal solution will present itself as soon as possible.