I don't remember much about Yggra Union despite playing it one time. As for Riviera, I seriously tried to get into that game, but got fed up with it within a few hours. There were so many aspects of the game I didn't like: the lazy navigation from one identical-looking screen to the next, the stupid treasure chest trap puzzles, the bare-boned combat system, having to reorganize my inventory every five minutes thanks to the limited space, all the pointless banter between Ein and his loli companions, etc. I really don't see the appeal in that game.