Undertale mobile version is a port made by fans for those who don’t leave their phones. You control Frisk and route his actions with a sensor joystick. Mainly, you will use only the wheel pad to walk, pick things, and talk to monsters.
It may be difficult, but you can dodge and attack as precisely as PC players, if not better. The keyboard can be hidden, so it doesn’t interrupt cutscenes. On the whole, it only proves that the story feels wonderful on any device.