For android try GODOT. That is much better if you want to make android games, not starting professional career (ie. making games for somebody else).
Ios and android have 120mb limit for app size (maybe it is bit higher now). At with unreal it is almost impossible to make game that fits in 120mb, so as dev you are forced to make downloader and host actual game elsewhere.
And yes that card should be ok for mobile games.