Yea shit like that happens. Mine game was a gigabyte at "first build". All because of downloaded models. But because of fixed top down camera it was pretty easy to bake the scene from a screenshot. Where it was a ton of objects now 4 planes with a texture. Also a lot of normal, metallic, emission textures i compressed to 1x1 pixel. No one would care. No one would see it. But the game that was a gig now 200 megs