Unstable Matter
This game is from ldjam.com, which is currently unavailable.
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In this game you can play as Unstable Matter that you can switch between 3 states: solid, radiation and orbital. In solid state you are affected by gravity, you can move left and right but you can't jump. In radiation state you simply fly in given direction until you hit something or change your state again. And finally, orbital state allows you to fly freely within a certain distance from the place of transformation.