I actually did play the RMN version of this a few months ago, but I forgot to comment.
I remember liking the atmosphere, and the puzzles were really well thought out. But I stopped after a while, because the levels started to feel kinda long, and required a lot of thought and planning. I remember thinking it would nice if the mid-game had some smaller levels that were quicker to solve, so that I could get a sense of accomplishment more often.
I saw your current trailer on Steam, and it looks like you do have some smaller levels now, and if so, then that's great.