Game Design don't load in mobile, why?

Hello developer, I programmed a Game Like Catalog Avatar (you can try different tipes of Outfits) game because it is not very graphically challenging (two islands with a sea that are not big and consist of a maximum of 200 parts) every time I want to test it on my phone it only loads a fifth of the map (the loaded part is colorless) after a few seconds the game freezes and the screen goes black (even the basic GUI of roblox does not load) I actually wanted to release the game soon, what is going on :fearful::cry:?
here is a picture just before it freezes:

(If this is the wrong Category, please informat me, so i can change that)