As trailed here, we were looking for a tag-line a little fiercer than 'mostly beige, mostly text'. Thanks all who made suggestions - there were a lot of very fine ones.
We realised rather suddenly that there was a phrase we were already using that sums up what enthuses us, what makes us different, and what indicates what a practical, specific, alligator-wrestling sort of business this is.
Here we are:
Failbetter Games: narrative engineering