Every member gets to post one ( and only one ) idea! Let's see how many ideas we'll eventually get! Here's mine : Coloured lines and scenery!
Math power-up. When you hit this power-up the game pauses and you need to solve a calculation in about five seconds, otherwise you die. In the editor, you could choose how hard the calculations are and length of the time limit.
Cat power up which is annoying because a ton of cats jump on your screen and you can't see anything then you die and restart but the cats spawnkill you then you die then die then die then die then they leave you alone then the jump 5.776 times and then a giant heart appears and then they go away and then you hear a meow and then you win. The end
I love it! And then when you're done you jump off a cliff and die, and the last checkpoint is BEFORE the maths powerup! muhahahahahaha!