This is great game idea, very enjoyable to play and it left me wanting more. The interactive guide is excellent. The only issue I had was that there seems to be a height below which you can't click; it would be nice if we could see the clickable area so that it doesn't feel like clicks are being ignored. I also wonder if you could remove pressing Space and simply drop them as soon as they're all placed? Overall nice graphics and audio design. Great work!
PS: Thanks for the Linux build.