Dropping a comment to let you know I enjoyed the game! I didn't play all the way through but it seems very well polished, even in alpha state. After a brief bit of confusion starting off just due to a lack of any tutorial, I quickly figured out what the next steps were to progress.
Two bits of feedback initially:
1. Was slightly confused on the reason I was not gaining anymore energy after placing the mine tile, but it was intuitive enough that I realized that it was draining the energy. It may be beneficial to inform the user before placing this tile it will drain energy/needs to be powered on (starts in off state).
2. The "Next" upgrades show the same balance on the first upgrade. I assume this is simply stating that you will gain that much on an upgrade, but on the first level it appears the upgrade does not improve the production. Maybe a verbiage change should be considered.
Hope this helps!