That Pokeyman Thing is a twenty-minute browser game that was put together partially in response to an interview with Werner Herzog in which the dude totally does not understand Pokémon Go.
To me, as someone who is still keeping up with Pokémon Go, That Pokeyman Thing captures the experience of playing the game quite well - it's more than a little stupid, but it's actually kind of fun, and it does encourage you to leave the house and explore your neighborhood. I usually hate WASD games, but this one is well written and well programmed, and as an added bonus the music is super catchy.
I'm on Level 27 in Pokémon Go, if anyone cares. I have been on Level 27 for months.