Appreciate your reply. Over-gravity is kind of a mechanic combined with the limited resource in the game, it gives player less luck to decide when to boost or not at deadly situation, so that requires player to think more before the move . I called it "Just do it and give it a try" or "Look before you leap“. Sincerely, thanks for your advice, you are right, it seems truly need another balance of the gravity and difficulties, it can't be the only challenge players need to overcome in the game. A lot of playtesting still on the road. :D