I feel you on the forgiving part. When creating a game like this, it's hard to gauge the difficulty of the puzzles, because you know how to solve them instantly :)
I had some concepts for more difficult puzzles, especially involving the teleporters, but due to time constraints and to push a complete game I had to cut down on those.
I think in jams like this, it's hard to expect people to play your game for more than few minutes. So extra props for anyone who manages to reach the end. It takes me about 10 minutes to beat the game and I know what to do in each level more or less.