Also just a brief fix for anyone reading these comments:
If the UI context menu of the screen fails to display, set the resolution of the game to 1920x1080 or 1680x1050.
The UI doesn't seem to work at smaller resolutions and changing this setting in the escape menu will fix it.
Viewing post in Termine (Hold & Character Demo) comments
I'm guessing here, but if reinstalling doesn't default settings back to normal, then they might be saved in the users -> appdata -> LocalLow folder. Its hidden on your hard drive by default and many applications save settings here which persist between installations. Try to delete the Starvy folder there and see if that resets things?