Nice design! I'd add some dot or something to know where you are aiming. I tried a couple of times. The first time I got stuck and had to read the hint. Maybe it was too difficult (at least for me). Then after the door moved and disappeared, I went to the entrance and the game froze. I tried that one more time just in case it was a one-time thing, but it froze again.
Nice game and as many others commented, nice voice acting!