There are a lot of releases, and fairly often; I've had versions go "out of date" on me within a week of its release. The forums are very active, and when they say something is unbalanced or broken, it tends to get fixed. Some things are not serious game-breakers, even if they are mildly broken (see: elephants in the versions that Boatmurdered used), and those tend to stay in until it becomes a pain to deal with.

Basically, it's just trial-and-error. But it makes for an interesting game, because you're never quite sure if everything will work as expected.