Thanks for the feedback, I had the cursor disabled during the level and really should of enabled it on the menus. Also the button that is currently selected is the darker one which is really confusing and I didn't realise my mistake until after the jam ended.
edit: the reason the UI clips of the screen is due to the way itch loads unity projects, there should be a blue full screen button at the bottom right which will expand the space to show the covered UI.