I get tis error on my computer: "Unable to get property 'getParameter' of undefined or null reference" (Had to switch to another PC to try it)
The puzzle the are the right difficulty (at least for the first 2/3 levels) and overall is a pretty cool game, the only thing i would say is that sometimes the spacebar resets the level (and it really sholdn't do that, considering that the same button is used to open doors)