Porting from other devices?

Have a look on these posts:

https://gamebuino.com/creations/arduboy-crosscompiling

https://gamebuino.com/creations/port-games-from-classic-to-meta

It's make already 2 port of games possible but then you do that, you dont use all possiblities of the Meta.  If you want use them, you have to see how tha autor have make his program and recode it for the resolution of the Meta, change sprites to add color, change system of sound,... it seems to make alot but it's not very hard in reality but you should begin with simple codes.