I had the idea to make a scrolling platformer that has you jumping from spinning wheels for as long as you can without dying. Originally I had the idea to have slowly rising lava at the bottom that would destroy the player sprite on collision, but I showed the demo to a friend and said that was really similar to a flash game that he played once. So we both came up with the idea of water that doesn't instantly kill you, but lowers your jump height and would destroy the player sprite after say, 6-10 seconds. I'm not sure how I could do this though.