Hey, cool game. Seems a bit unfair to upgrade the rover if you die. You just send up in a death spiral. Maybe include more methods to evade the rover like tossing rocks to distract it or kicking up some dust to obscure line of sight.
At the moment the best tactic is to pick smaller size and see through walls and just circle around the nearest rock.
EDIT got the laser gun and shot the rover and then the game crashed lol