I know of the REminiscence engine, a rewrite of Flashbacks engine.
http://cyxdown.free.fr/reminiscence/
It's source is downloadable from the site, and is done in SDL, so I'd imagine it woulden't take much to make it able run on a Maemo device.
Fun fact of the day (i think): If I'm not mistaking, the iPhone port of Flashback was based on this code as well.
I guess what I'm saying is, that I second LuckTRs request for a port of Flashback atleast, as I know thats achiveable