Finished Environment

I added toys, books and foliage. There's nothing much I can add without making it too distracting. It's a fast-paced game, exploration is not a part of it, so the environment can't be too flashy. 

Assets Used:

Books by VIS Games. Link: Books | 3D Interior | Unity Asset Store

6 x 3D Cute Toy Models by Psionic Games. Link: 6 x 3D Cute Toy Models | 3D Characters | Unity Asset Store

M40A3 Sniper Rifle by Game Stuff Studio. Link: M40A3 Sniper Rifle | 3D Weapons | Unity Asset Store

Wooden Chairs 2 Variations by ANRUVAL_3D_MODELS. Link: Wooden Chairs 2 Variations | 3D Furniture | Unity Asset Store

Lemon Trees by NUMENA. Link: Lemon Trees | 3D Trees | Unity Asset Store