That is the current end yes. More is planned later, but I can't say when that will be. There should be an unlock the first two times you do it though. Depart essentially takes you to a fresh world for a newgame+ on a new seed. The option is technically available the whole time, but costs 1000g if you've not done that fight. Explore is currently unimplemented.
Yeah, those can sometimes throw some super obscure words at you. If you check the stats, it'll tell you what they were on there. I should probably add a postgame screen to them.