I thought the controls were pretty clear, but I couldn't get the drill to reset after reaching the first oil reserve, so I was unable to meet the second day's quota. Hitting B seemed to freeze the game (but not the timer), and the music stopped after the first day.
When I started a new game, I started on Day 3, with the drill still locked in position. The oil already in the tank didn't reset, either. (Also, the controls on the title screen are different from the rest of the game - Enter starts the game, and you can move up and down with a controller but not hit any buttons)
I also noticed that extra oil barrels don't carry over to future days, so the best thing to do is to do *just* enough work and then leave the rest for the next day (or days - I got enough oil to fill ten barrels on the first day) rather than working as hard as you can each day. Was that intended?
I like what's here, though, and I think I'd like to play this game again after some more playtesting and bug fixes.