Two Issues I've found so far, the most crucial being, after destroying a portal it'll say 'Cannot go east as there is no monsters/portals' (Paraphrasing) but that's essentially what it says and just stands there doing nothing. It crops up every couple of games.
Second, sometimes when running across the map, it won't open the gate but run around, looks a tad botty is all.
Otherwise, it's pretty good with a little babysitting.