Nicely done! Really impressed by the art. Sounds effects and music established a nice chill vibe as well. Gameplay was fun! Clicking my way across the map was enjoyable.
My feedback would be that I'm not sure if the visuals support the gameplay. For example I don't get why more buildings would provide more energy? Wouldn't they use up the energy? Some of the effects of the buildings didn't seem to match as well. Why should a toll both, a very small building, have a high energy cost? Not that important but it did make it harder to learn the mechanics since the way the building looked didn't hint at the effect it would have.