Uploaded the correct thing.

Okay so apparently what I uploaded on Tuesday was not the right thing,
even though I tested it multiple times to make sure it worked, before
submitting it. This one should work.
Sandbox is the scene you want to use. WASD or arrow keys to move, left
mouse to shoot, shift to sprint. NO JUMP.
Collision works. Our square friend can go up slanted surfaces, up to
about 45 degrees -- I put in two surfaces that exemplify such a thing.
Gravity works (Try falling off of the climb-able tilted block. You can
even land onto another block nearby).