I am really impressed, but I saw a few flaws that stopped it from being spot on.
1. When in the dark room it seemed like the first room that you fell into was bigger than the actual map.
2. I know this is probably impossible but when you spawn a horse, the water has lightning bolts on top.
those are the things you need to improve and the Jeep course but you are working on that already.
1. The dark room is exactly the same size. Trust me, it just looks bigger because of the lack of darkness - measure them both.
2. If you look on the water while holding a wrench/hammer/whatever you'll actually see four invisible yellow bricks which, if you set their emitters all to RadioWaveExplosion, will create the zapping effect.
EDIT: Hmm, that's interesting, the bricks are now missing. Well, if you look in the Tutorial bricks tab, there is a 14x14f brick which you can lay four of down on top of the water. Spray yellow, make invisible, add emitter. Bam.
EDIT: That explains why the bricks were missing - I had made a measurement mistake and the 14x14fs no longer fit over the water. Give me a couple of minutes to fix this.
EDIT: Oh yes, I did steal Space Guy's inverted corners and add it to the Tutorial brickpack to make sure the user didn't need any non-default add-ons (other than the ones included in the .zip, of course) to load the save correctly.