An interresting concept and a near perfect execution.
As other said before, sound design is as usefull as accurate, which is too rare to pass mentionning it. Progression in level design is also a proof of example. Several levels are used as learning tools. They lead to other ones introducing more challenging ways to reach the stairs. Then, the next levels introduce death pebnalties. Finally, the two last levels can be as complex as a huge labyrinths.
In conclusion, a pleasant experience, and a reallly impressive game given it has been made in only four hours.
As usual, I'm looking forward to see your next games ! See you next time Ardos.
Bises.