A nice game, though I personally don't think it fits within the limitation as the player moves quite explicitly. I don't know if I just didn't get it, but the code was impossible for me to solve, even with the clue in the comments on the page. Is there a button I have to press to enter the code or is it supposed to work automatically? I don't know what I didn't get.
All that aside, it shows potential though there's definitely a few rough edges. Visually, the colors are too jarring. and either the lack of contrast or shading makes it difficult to distinguish some parts like the icons in the buttons of the elevator. The music was fine but got old fast, the third or fourth loop I got tired of it.
I will be more reserved on the puzzles as I'm not much of a puzzle enjoyer, it takes a specific kind of puzzle for me to really like it and this is not it. However, I can appreciate the effort put into this and if people are liking it then I guess they're fine, though I felt something off I can't quite put to words.