Sweetness! Looking forward to seeing more.
As for retreat/flee... I'll give some unrequested feedback, hah! Feel free to ignore.
Why not make it a dice roll that is affected by party variables (weight/types of items equipped, total party quickness/technique/perception, and status ailments)?
On a successful roll the party can be warped to the entrance of the zone. This isn't ideal, but I can't remember a turn based blobber that did fleeing well. However, I have found myself wanting it in many titles.
And on an unsuccessful roll the party loses a collective round and is more vulnerable to attacks since they would have their backs turned (ie, no shield bonus and increased chance for attackers to land attacks); I believe this is actually the ad&d behavior but you'd have to find a manual to confirm.