Thanks for the feedback! Indeed, as you said it seems that once Explorer/Mapper is selected you are stuck as that(to be more specific the buttons break after entering the main menu for a second time :D).
Regarding the art, I want to clarify that most assets used are ones acquired via HumbleBundles GameDev bundle over the years with minor tweaks in PS and some shader/material effects in Unity to try and make them look a bit more similar.