This project is currently pre-alpha, and though it's technically playable it's not even remotely entertaining. If you're interested in playing, please check back in a few weeks/months.
However, if you're interested in contributing then now's the perfect time. The game is still malleable, the codebase is light, and there are lots of really important decisions still yet to made. In other words, this is a really fun time to join.
Clem syntax and practices documentation
More information to follow.