Cool game, it looks pretty nice like something that could blow up in the right circumstances. I won't say much about piling up objects or issues with selecting particular tiles to place windmils or solar panels. The major issue is optimization. You need to fix the opt issues cuz I almost burnt down my GPU (like literally after a few minutes is was around 90 degrees). Dunno how you managed to make your game consume so much GPU but please pay your attention to this aspect of game development, it's really important in 3d projects.