This is a fun game. I hope you produce more. I wanted to note two bugs -
1. The allowance for recharging the battery doesn't seem to affect the price of recharging the battery.
2. The diamond chasis never gets a 'No need to buy' and can be purchased numerous times.
Both are minor bugs and don't really affect the overall playability of the game. I look forward to seeing more from you!
 "Boom Town"){kind=icon}
 "Utopian Mining"){kind=icon}