Just repeat this through the song
       E        Am        E         Am
|----------------------------------------|
|---------------------------------1---1--|
|---1---1-----2---2-----1---1-----2---2--|
|---2---2-----2---2-----2---2---2----2---|
|-2----2----0----0----2----2-------------|
|----------------------------------------|

Every once in a while change the Am to C     
 
       C
|-----------------|
|-----------------|
|---0---0---------|
|---2---2---------|
|-3----3----------|
|-----------------|

It's very simple and is the exact same as Bo Burnham's "Rehab Center for Fictional Characters"