Haha thanks for testing anyways! What you're describing seems like a bug unfortunately and I think this is primarily due to Love.js, I don't know how battle-tested it is when it comes to mouse-lock on the window. Chrome works fine, but Safari has mouse being veery slow for example.
Thanks, I'm glad you enjoyed it! I never made puzzle games before but I have some ideas for this project and I plan to flesh it out a bit more so it's not just a minute of gameplay XD