Nice work! I played through to the end, and the snail was mad at me. (I am a big fan of the bug art btw)
The theme is followed very well - each room is a logic puzzle where the inhabitants give you riddles for you to sort out which doors they do and do not want you to enter. Beyond that, you also need to keep in mind that if they DO what you to enter all different doors, then enter the one that no one wants you to enter. BUT if they all want you to enter the same door (or some want you to enter a door and others don't want you to enter other doors) then you SHOULD enter that one.
Thankfully, the hallway scene works as a great intro and reminder for what you are trying to do. I liked the hallway - the wall variations were nicely done. Sometimes, I wished I could sprint through it, but it was not too long.
Also, movement felt great to me, especially for a web based 3d. I did not feel motion sick, and the camera movement was smooth.
The riddles are funny, and have some pus/wordplay based on the critter who is giving the riddle, and the symbols on the doors were apparent (for the most part) as to what they were for. Easiest to understand was the card suites. Hardest was the explosion symbol. And the most complicated riddles were the fruit rooms.
I really liked the art - the critters were well drawn, and I like little bugs and things in my games. The music was also very nice, sort of a post-rock soundtrack? It actually reminded me of some of the Transistor (by Supergiant) soundtrack.