Asteroids

The Space Game marries the resource extraction component of an RTS with a tower defense game. No surprise here; The Casual Collective is Paul Preece and David Scott. Preece created Desktop Tower Defense, though this is Scott's game.

Relativistic Asteroids is just Asteroids -- but with (some) relativistic effects added -- specifically, length contraction and time dilation.

As your ship accelerates, the little triangle that represents it visibly shortens (length contraction), and if you rotate, contraction is retained in the direction of motion, but not the others.

Time dilation isn't particularly notable--except that your bullets travel a shorter distance (when fired in the direction of motion), presumably because, in their frame they "expire" more quickly relative to the reference frame.