Hi Fiach, here's my two cents as well:
Like Ville wrote, the talent tree in our current version is considerably less finalized than in the full version (which has been undergoing beta testing by us, and in a few days by our beta testing group).
We're trying to focus most of our efforts into getting everything in the game finished soon, and I think that's why Ville forgot to mention that the Vanilla Driftmoon does actually have some mage skills, a bit later on into the game (bless, and summoning a stone giant, for example - and naturally we have a bunch of potions as well). Just wanted to mention it, so that you don't get the wrong idea. And in addition to those, there's a whole bunch of other non-melee based tactics you can use against opponents, once you advance a bit futher (you can build your own walking, exploding barrels, use mines, etc).
But like my dear husband said, while we've actually put quite a lot of effort into combat as well, Driftmoon is not a game heavy in combat - there's many more things to do in it, than just fight your way through. If you'd like more combat in it (and thus, also faster advance in the combat skills), I suggest you play with one of the two harder difficulty settings.