I mentioned TerraTech way back when I saw it at London's Radius Festival. It's a construction/crafting game where you can assemble all manor of blocks, wheels, wings and stuff. The only thing holding you back is the game's loose internal nod to physics and personal taste, meaning you can pretty much hobble any old parts together and make just about anything.
I've been trying to fly however.
The Rocket Challenge is an in-game mode that provides a collection of flight-themed parts and lets you spread your wings. Or in my cause plow increasing deep furrows into sand dunes.
This is me attempting to fly.