pick up the key from the room (which has the piano) use it to open the door down the hall that should take you to next part, that door is not supposed to take you to the tv room, I tried to reproduce the bug but failed to do so, so kindly let me know if that is what is happening. (you can try changing levels by pressing the F1,2,3,4 keys to test.)
This is what was happening with the door. I thought it was some kind of puzzle I had to solve haha. There were a couple other small problems I ran into too. When I interacted with the tv, I couldn't interact with it again or any notes unless I paused the game. It would work again after unpausing. Also, I paused it while reading a note and the text wouldn't leave the screen. The cursor would appear when I pause it but it wouldn't let me exit the note while paused and the text just stayed up while I ran around haha. That was probably my fault though for pausing at a weird time.