I have windows. I played up to the third time you encounter the thwomp esque laser shooting thing. After I finished the game, instead of taking me to the next level, it frooze. And after a few moments, I tried alt+f4 to force close the program, but that didn't do anything. I used Ctr+Shift+Esc to open task manager, and the cursor froze. After some time, I hard turned off my laptop.