Double Jumping

For our game, our gravity is centered around a block. We kinda regret we didn't make it where there is no gravity and instead just use the up and down arrows to move. We spent way too long getting our gravity to work, so instead of getting rid of everything we figured out how to make our character double jump to make the game easier and make it seem more like you're under water (you just have to play the game to understand what I'm talking about).