Continuing on with my previous post the lack of resources in the surrounding area will be devastating, maybe more automation could be included, such as a mine that collects ores and rocks and by a very small chance radioactive material from 'underground' and runs on electricity, or a room where it can auto harvest fully grown plants. Maybe new resources that can only be found 'underground' such as natural gas, crude oil and coal, these can power buildings in maybe the development of the game further down. A new research called 'Automation' or another one called 'Fuel'. More dangerous disasters could be created, and defences and forcasting buildings could be added due to that, like lightning rod for storms, or maybe you can use these disasters to your own use, wind turbines that generate electricity and they generate more in storms but have a chance of breaking; Lightning adaptors which can use lightning to power the base(Note: This building would be a limited use item, like it would break after a certain amount of strikes). These suggestions bring more things into the game and adds more research. I could go on forever but I'll stop.
Feel free to tell me any bad sides, I'm new to posting and I would be genuinely happy with corrections, and mind my messy paragraphs, I just wrote down whatever I thought of at the time.