You know, you've really got something here. One of those rare things, a game that's equal parts frustrating and riveting. I didn't want to stop, even though I lost my mind!
I also enjoyed the "having to figure things out on your own" aspect, learning what everything does and when to use it. If you hold players' hands too much in a game like this I think something would be lost, so definitely keep that aspect =)
All in all I think this is looking really good so far, especially with the nice mysterious story hidden away in the background! Keep up the awesome work, can't wait to see where this goes next!