I have some qualms about UE4, mainly it's fine because of the lower level for compiling, but the way it handles 3d render meshes, textures and post processing is abysmal!
your game is fine for it, but whew! some 3D game using UE4 makes me wonder if the devs evr tried to run the game on a normal PC before pushing it to public, haha xD
15 fps gutter-asset trash packs aplenty on Steam ( and I own more than a few of em, haha )