Rabbits Dungeon Level - Looking for some ideas 

Actual state of the gameplay with 4th type of level: The dungeon. It is a procedural generated maze. Goal: Find your bunnies and bring them home save.
It is a bit too empty. So, what do you think would fit? I appreciate every constructive feedback.
Game engine: Unity3D 2022
I show actual Framerate next to the time bonus counter. I played on an 4 year old MSI i7 Laptop with a RTX 1660ti.