You won't be able to install arcade. Pip might say it installed, but it won't work.

Pythonista has its own unique game module called scene. You won't be able to reuse code from other engines, though you can translate most of what other simple 2d engines do to something equivalent in scene.

@Cethric developed an engine that makes use of iOS OpenGLES, including a basic physics engine:
https://github.com/Cethric/OpenGLES-Pythonista