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There's not much to explain, bodies shouldn't just be traits. Fat zombies have reduced mobility, make more noise (which may attract more zombies to you), can break wooden fences but cannot go through small windows, the same should be true for the player, but him could not jump high fences. .

Houses are no longer cleaned or repaired regularly, textures should gradually become dusty, walls should lose their paint, outside should have details of dirt, moss and dark polution marks and inside should have details of seepage and mold with wall debris on the floor, in a Silent Hill 2 or Chernobyl vibe, you know? I feel this needs to be more aggressive in the game. It seems that the houses, internally and externally, do not follow the advance of vegetation at the same intensity, after a long time everything is still clean, perfect and happy. Anything metal in the game should oxidize; cars, grills, garbage cans, blades, poles, even slides, swings, etc. everything should loose paint and rust. The woods should rot too.

The idea is to modernize the furniture moving system, which is a little complicated, takes time and its unrealistic. With 3D furniture + push animation you could just grab the side of any furniture and drag it free at any angle, that goes for cars too. obviously it all depends on your character's strength and well being.

Well, it's the apocalypse, there are no more cars driving around to push the leaves to the corners of the roads. Streets and roads near trees should become covered with leaves and branches over time, but could be cleared by wind or storm. Leaves could be used in compost or as fuel.

There's something in the character's vision system that could fake shading, adding ghost npcs to light sources and you could see their vision shading what they can't see. the player would be interpreted as an obstacle and making a notable shadow when passing in front.

the idea is good, but a child would be a dumb npc that follows you where you go consuming 2x more food/water and drawing 2x more attention besides being weaker and inexperienced, a useless weight in the game