How to show where the invisible cursor is → use terminal:

1. install xdotool: sudo apt-get install xdotool
2. use command: watch -n 1 'xdotool key space'

In game you can show your cursor by pressing "space" or "ctrl" → this command will be pressing "space" for you every 1 second which will create pulsing red rings around the invisible cursor and will let you play the game. When you are done playing just close the terminal and the command will end.

P.S. doesn't work in main menu → use "ctrl" instead