The game must have first-person exploration at all times. (See the above GIF). Exceptions are point to point overworld map movement (fast travel), combat screens or town screens.

Are minigames (in general) or minigames that don't use first-person perspective within the guidelines?

I don't get the impression that they are but I just want to double check. Thanks

Depends to what extent they are used. If it is a game of minigames with occasional first person exploration then no. If the minigames are used as a small addition (i.e puzzle) to the gameplay then sure.