In the menus, i can't see my mouse or move it
This is very weird... are you on windows? what version?
Maybe it's not the solution to your problem but you can use SPACE key to press the main button of the menu so meanwhile we find the problem you can keep playing.
Also you can try to play it on windowed mode, please tell me if it helps. https://itch.io/t/401465/windowed-mode