I was thinking the classic amiga route OCS ECS and AGA.
This is purely for selfish reasons.
Currently games can be compiled for:
Windows (95, 98, Me, NT, 2000, 2003, XP, Vista)
Pocket PC / Windows Mobile
Handheld PC
Windows Mobile-based Smartphones
GP2X
Linux
On the next version I understand work is being done on some other platforms however I'm not 100% sure what these are.
I would just love Amiga to be added to the list as I think a lot of people would benefit from it.
The following link is a Commodore 64 quiz I made with GE. You just need to download the exe file. The other files are the editor
https://skydrive.live.com/redir.aspx?cid=17e9c6d1acca95c2&resid=17E9C6D1ACCA95C2!191