Algodoo

LEFT and RIGHT to control the thrusters, UP and DOWN to twist the nose in the respective direction.

This is a very unconventional vehicle and may be hard to use at first. It is stabilized with aerodynamics, so some maneuvers may work very differently at low speeds than they do at high speeds. It is also just barely capable of sustained flight if you point it almost straight up, but if you do the course right, it shouldn't be necessary. Use the last hill as a jump to get over the wall, and make sure you have some speed built up before you get to it. Don't feel required to spend most of the course on the ground.
If you bash through the wall instead, there is a chance that some shrapnel will set off the laser too early.

To get through the laser room, just charge right through it on the ground. You'll set off the laser, but it will shoot over you because of the vehicle's small size. If a stray block has set it off already, you won't be able to get under it and will sustain some damage.

If you really want to and you've gotten good at controlling the car, you can try flying over the laser room instead, but you need to go very high because there's another laser pointing straight up. The same technique can get over the wall if you screw up the jump.

This car can complete the course in under twenty seconds.