Pretty Good
With the exception of the shape puzzle, all of the puzzles had answers that felt very logical to solve. The shape puzzle felt like it was logical, but there was either a key missing or something I just wasn't getting. The differing sizes and positions of some of the shape signs confused me. It ended up just being easier to "force" my way through that puzzle, trying every combination until I found the right one.
Some music and sound effects would have been nice too. Other than those two things, pretty darn good.