Hey, thanks for playing! Right now it’s English and Russian. I’m planning more languages for Steam, and French is on of the crucial one's in my list.
Sure, you can email me at disagreeg12162@gmail.com.
About batteries: on “Use it” they pass power straight through, so spare power gets wasted on purpose, since managing it is part of the puzzle. If you want a battery to store power, set an Output limit on it (anything above the limit gets stored) or switch it to “Hold it”.

