I think what you have here is a respectable start for a game! The visuals look pretty good, and the day/night cycle provides a potentially interesting core mechanic. As is though, there isn't a whole lot to the game; it's pretty much just a couple minutes of walking between crystals and the ship, and the battery mechanic barely matters as a result. If you were to keep developing this game and add in some extra elements like hazards, other missions, and what have you, this could grow into something solid!