It works for me. (MacBook Pro, Mac OS Lion 10.7.2 and MacBook Snow Leopar 10.6.8 )
It does not work on Leopard, that means you either compiled on Snow Leopard or you used macosx_version_min with 10.6 as its parameter. You should be able to use Leopard without any problems. (SDL and Lua are both Leopard-compatible iirc.)
You should also add a 64-bit executable to the app bundle.

On my Macbook with the integrated Intel graphics card the game is much slower than on my MacBook Pro. You definitely need to implement deltaTime for independent movement and animation speed.