That was a cool little experience! I've got some critique and praise for it:
Stuff I didn't like: With an isometric game, especially one that has a movement mechanic like the floor tiles, I'd love if the arrow keys moved along the iso grid instead of directly up/down/left/right. It made the puzzles more tedious than they should be.
Stuff I really liked: The floor mechanic was really interesting. I feel like that could be explored quite a bit further. The art is pleasant and very readable (I sometimes have trouble with color-based puzzles, but these were crystal clear).
Great entry with a fun ending -- I'm glad I became the Explorator!