The game also seems to have more fantasy themes than Dead Maze which many people have been comparing it to, with all the swords, herbs, and
I'm also really excited about the "rich story" the post mentions, and I'm happy Berta and Mirolle are going to appear (in my opinion, they're one of the very few characters that actually feel like characters; Elise and Papaille have their backstory with being based on real mice and all the legends about room 801, and Von Drekkemaus had his enigma in 2014, but most Transformice characters are just kinda blank and dull, being only backgrounds or vendors for events).
I also have very high hopes about the fact Atelier 801 is going to accept community feedback all the way through the project. If they work with the community right, the game has potential of being something great.

On a side note, I noticed there is a blue-ish tail on the right side of the gif from the original post. It moves slower than the tails of the other mice present on-screen.