Depending on how long you play, the mouse starts to drift towards the relief room and “no” on the quit game menu if you use the teleport room. It’s a feature meant to simulate the hypnosis effect. If it happens somewhere else it’s a bug.
Hmm certainly weird. Probably can’t fix it, but if you wanna help, could you tell me: Did you play the browser, windows or linux version? If browser, on what browser and operating system? Does the mouse always move at the same speed to the right? And does it start after moving the mouse or by itself?