Just a quick update since it's been a little while. Progress continues, if a bit slowly over the last few weeks. Between Guild Wars 2, helping out in XNA Chat and general Laziness, not too much has been accomplished but there HAS been progress.
I've added in a few more monster types, cleaned up quite a bit more of the Vita code, added a splash screen and several other minor tweaks under the covers.
Hope to have more soon, maybe even an updated demo! For now, I'll leave you with a couple more screen shots off of the Vita build: