You mean there are parts of the user interface missing? That's very strange. Could be a memory problem (but then if the game work fine otherwise probably not), but I guess it could also be some sort of incompatibility between the rendering engine and the phone. What device do you have?
Ah... I know what's going on here, and I know how to fix it on Windows, but not on mobile. You have the phone set to a right-to-left language, and for some reason Godot (the engine I'm building my game with) thinks it's a good idea to switch every part of the UI around for that reason... I know on Windows you can run it with a '--language en' option that tells it to force english (the english part makes no difference, since the game is english only anyway) and left-to-right in game (the important thing). However I don't know if you can do this on mobile. I'll try to look for some sort of option to set for the project, but it will be a while until it makes it to the free version. I guess the only workaround for the time being would be to set your phone language to either english or another left-to-right language while playing the game. I know it's not a great solution, but I'm afraid it's the only one I have for the moment, until I get this fixed more generally