Hi, I’m running the IndieQuilt jam so I thought I’d chime in!
First of all, everyone is free to contribute non-Unity games to the jam itself. Of course, it’s the IndieQuilt Collaborative Game that is the real appeal here, so I understand that it’s quite a turn off otherwise!
I’ve been working with some smart people about the idea of setting up the ability to weave non-Unity games into the IndieQuilt. It’s a bit complicated and not necessarily possible, but some people do think it can be done. If I can manage this, it will open the gates to a lot of other developers!