I like the game very much. I like the idea of partly idle game. It is hard to start the game and it is hard to move forward at some points, but it is worth it.
1. Unfortunately it is easy to have game over when you pausing the game. Why? Because the "reactor" is still going. (Workaround: stop the reactor, then pause the game)
2. Also it is strange that power plants are producing heat when they run out of fuel.
3. Lack of savegame (the button exists but it cause an error) is also giving the game harder mode.
4. And the last one: I have spot a sequence of price for expanding batteries: 1k -> 20k -> 400k -> 20k -> 400k, while "normal" behaviour was 1k -> 20k -> 20k -> 400k.
Except those bugs the game was great and I want to finish it by building higher tier of buildings on hard mode.
Also I have a question: do you consider auto-selling energy when you produce heat instead of energy? Think about this mechanics: you are auto-selling energy (with f.e. 20% of efficiency instead standard 40%), but you are also producing heat. So still it is better to manually sell the energy, but idling is also possible.