I’m wondering if it would be possible that have a character interact in an environment like this one:
dandadministryofsound.files.word … rn0011.jpg
I imagine climbing, walking, flying, etc. Is this possible?
I do not see any problem that would prevent you from creating an isometric game, even if GD does not provide specific feature for creating such games ( as any other game development tool I think ) : You have to create the entire game engine by yourself. 