Manifold is a gravity-based game by Joel Esler. In this game you have to shoot balls of gravity in orfer to get to the finishing point. You can collect ammo from a field, wich has arrows pointing to somewhere. Click and then hit the Spacebar.
To shoot click and then drag the arrow to the direction you want to go. beware of long falls and gearwheels and ect.
Fun game with simple graphics and few levels.