This is a really cool platformer with quite a bit of polish! I like the selling your jumps idea! But there are some bugs or a few tad bit annoying things. For example, when i shot an enemy they would straight up turn invisible. I don't know if that was intentional, just wasn't fond of it. And if the player kept moving to a wall, you could become spooderman and sit on the wall. All around pretty neat idea and cool game!