Like most emulators for modern game consoles (and especially for Android emulators), the compatibility list for Play! is very limited. Some games don't work at all, others only halfway, and others work but run more slowly than they should.
The setup options on Play! are very limited as well. Users can only search the directories on their Android device for an ISO or .BIN file to load the game. Still, luckily the application does automatically rotate the screen when needed for a certain game.
Play! is the first PS2 emulator for Android and as such has quite a few problems. With future updates, which with a bit of luck will come sooner rather than later, many of these problems will be resolved.