I absolutely loved this!
I already beat the game before coming on the website, but I must admit your submachine series is ALWAYS enjoyable to me. The atmosphere is tight and vivid, while keeping the vague mysterious feeling that keeps you wondering what's next. My only regret is that there aren't more of them, but I shall be patient!
HINT: For those playing the game and don't want a spoiler, keep this in mind, make sure you've looked EVERYWHERE and gotten EVERYTHING before you use the last shape. I made the mistake of putting that piece down and got locked in the room thinking I had everything up to that point about 3 times. Once you make the mistake once, you'll know what I mean. If you really want to avoid it the first time, the walkthtrough is right there for you!