The quest marker points underground but we cant find the entrance

Hi, i'm lost in the game, where to find the rocks to collect please ?

We aren't vidographers but we cover most of everything for the newbie wondering how to play https://youtu.be/smGzDb5cVv8

does the game support controllers if not do you plan to add

Please make sure to add the feature to customise controls as i play on a different keyboard (Razer Orbweaver) and my layout makes it wonky to use the default keybindings, also i advise to add in the scroll wheel selecting function for easier swapping between quickslot items. Thank you very much!...