hmmm.. interesting. your game fits a lot more than steam gamers though, I can see it fitting in well in a lot of casual and young gamers. That, and the obviously large amount of effort you put already into keeping it 2.0 safe, I'd say to see if there is maybe a way to make that particular element work on 2.0 even if it is done by modifying the element specifically on 2.0 cards or even omitting it for players that play on a 2.0, by specify that there is some content that is current hardware compliant only?

It just seems to be a waste of all that effort, and a very viable demographic for your game. I can see many small children playing this who may never have heard of nor know how to use steam. Do you plan a box version of this game?