Was the last level actually a puzzle? Because I think I accidentally solved it while trying to make the last bridge.
That sort of highlight the problem in the puzzle aspect, the possible thing to do is too low, and the answer is too straight forward. You can solve it in your head pretty fast, the moving the gems around is probably the slower part of the game. Speaking of which, the isometric view with the WASD not pointing at the direction on screen takes a lot of effort to get used to, which is odd because since you can walk side way anyway, why not just implement the direction as what they are on the keyboard, would seems more intuitive to me. Thanks for the game.