This game seemed right up my alley so I had to try it, and I have some feedback that I hope will be helpful.
As some others have mentioned, finding the puppy gear as part of Truffle's quest makes it bug out and get stuck. I noticed that finding the puppy gear item deeper in the cellar before ever speaking to Truffle avoided the issue, leaving the muzzle and ears behaving correctly.
Also like others have mentioned, the current clothing inventory system is not good. Aside from being inconvenient at best, the way it fudges the order can cause issues when worn items override existing ones.
It is possible to start both of the available quests at the same time, causing the quest windows to stack and hiding the lower behind the minimap. While in my run I did not allow it to happen, I imagine getting equipped with the two outfits as part of the two quests could cause problems too.
It is possible to detach the player from the dialogue, letting them run around while the camera is stuck in the dialogue. The dialogue still functions normally and can be progressed as normal, aside from using F to do so being able to interact at the same time.
The parkour mechanics are a bit awkward. Having a jumping low ledge catch thing (for climbing railings without having to stop), along with a faster player, would be nice. The guards are currently pretty easy to juke too. I would guess there are ideas in that space though.
For my own personal taste, I'd request eventually adding a more nuanced clothing system than a pure collection, perhaps opening up for quests or interactions removing clothing items from the player's inventory, and maybe some kind of outfit exposure management mechanic.
Overall, showing a lot of promise, excited to see where you'll take this game.