Nice! We have another GUI with UCI engine features, including games between two engines. The app is called Chess Engines Play Analysis. I'd better call it CEPA in short.
Although the screenshots are in Spanish, the app has English menus. I didn't try it yet but all i can say about the engine features promised in the description is related to uci options management: Only the apps coming with uci option setting have been successful so far.
Threads and hash size settings are the fatal ones considering that most engines come with default settings that probably won't match your device capabilities and/or your preference.
Further tests will show how efficient is CEPA. You are welcome to react quicker than me :-)
CEPA is free and available at GOOGLE PLAY