Breath of Death VII - I forgot about that one! I bought it, played a little bit and then forgot about it. It's still on my 360. There's also Cthulhu Saves the World by the same people.
Ouya can side-load Android apps and games, and most of them work "out of the box" - but - keep in mind, you're interfacing through a controller, and not a touch screen, so if the games do not have controller support, you will have to use the controller's built-in trackpad, which is not nearly as easy to use as a touchscreen.
The OUYA has no built-in overscan fix, which means if there is important information near the edge of the screen, it may not show up on your TV. Some TVs are worse than others about overscanning, and some have options in the menus of the TVs themselves that compensate for it, but the OUYA does not have any such option. There is one thing you can turn on or off buried in the systems advanced options menus, but it doesn't do anything as far as I can tell.
Again, the overscan thing isn't an issue for all (or even most) standard apps and games, but when it is an issue, there's nothing you can do to fix it. And for some RPGs - there are status boxes, menus, and text boxes that may or may not be near the edge of the screen.
Basically, it's an app-by-app thing, you just have to try it to see. The main thing for RPGs, though, would be do they support controller input or not. If you just want to use the OUYA as a "make my Android big" device, I would suggest getting something else, either a Google ChromeCast or plugging your phone/tablet into the TV via HDMI, or something like that. I like my OUYA, and I like some of the games on it, but it's not the best Android experience. It's cool for what it is, an inexpensive game console with hundreds of free games - (all the games are free to some extent - first few levels, 24 hours of game play, freemium, or straight up completely free). But it's not a replacement for a standard Android device.