Free online multiplayer game. Battle with 16 players, TDM and CTF game modes.
You can change touchscreen controls in Settings → General, there are six control layouts available.
You can change button positions at startup in Change device config → On-screen keyboard → Change layout.
To play on some servers, you need to press Back → Join red/blue, after connecting to server.
Supports gamepads, supports mouse+keyboard controls.
Sources: https://github.com/pelya/commandergenius/tree/sdl_android/project/jni/application/teeworlds