Build-a-tower, a timeless classic
Art and sounds complement the game nicely + make it surprisingly satisfying
Very nice
Haven't found Enlightenment yet
I verified a machine that ran for 226,186 cycles, which took about two hours on the highest speed.
This machine would in theory run for about 14,000,000 cycles, which is about 5 days. (EDIT: bad math, disregard this)
EDIT: After some better arrangement and some machine-aided optimization, revision 2 has a theoretical runtime of 61,000,000 cycles ≈ 3 weeks.