I'm glad you could still upload the game so that we get to see it! :)
The rat model is and walking animation is super cute tbh <3 However, it wasnt exactly clear to me what my goal actually is, when I started, and what all different kinds of pickups do (it gets a little clearer once you pick them up and see what kinds of stats are changing of course).
I happened to find the goal relatively quickly on my first run - I am not sure how extensive the maze is or if there are paths that theoretically lead you to dead ends, so maybe I was just lucky! The end itself was a little underwhelming where it said that I won, and then a few seconds later I just got the usual "Game Over" screen ^^
I could really well imagine that game to be procedurally generated, where you have certain segments of your sewer as nodes that randomly sprawl off from and connect to each other! (If that is something you could imagine doing in the future!)