This game is somewhat of a troll in that what appears at first to be a strategy game instead is more a casino game. Go ahead and put this in casinos and require people to get > 850, 900, 950, and 1000 points to cash out and watch that casino rake in the money on this one.
Anything lower than 10 is just awful, but particularly when it's giving you such fine numbers as 3 and 1 while meanwhile the computer gets 15 and 19. It's mostly down to luck of the numbers it gives you.
There is no effective strategy here at all (for obtaining any of the high score medals) other than don't just plop them down willy-nilly and do try to protect what's already there and take what you can, but it's still not even close to enough because in the end the luck element is the only thing which might ever grant you those medals.
Is it trivially easy to beat the computer player in points at the end? Yes. But that doesn't get you a medal or anything. Game is like 0.0001% skill, 99.9999% luck if you want all medals. Or even if you just want that 850 points medal sheesh!