I just tried this demo after seeing this game on the "coming soon" section of gamespot.com.  I am a little bit addicted to the demo and would like the full game... however, I must agree with the previous poster about the price point being a bit high.  I was thinking I'd easily buy this for $9.99 while playing the demo, but then was surprised by the nearly 20 dollar buy-now option. 

I understand that you want to get paid -- but perhaps you will make more with higher volume at a cheaper price.  Wal-mart is doing ok with that idea.  Maybe try a 30-day $9.99 sale and see how that goes.

Also, this game would be perfect on Steam as a quick and easy impulse buy , provided the price is "impulse buy friendly".  And, way more people would know this game exists if it were on steam.  Any chance of you using steam to distribute?  I think that you just need a little exposure for this game to really get you some sales.  Like I said, I hadn't even heard of it till I saw it in the coming soon section of gamespot -- which isn't exactly prime real estate for advertising.