So naturally, I downloaded libTAS and got to work. Here is the result of several days worth of TAS'ing the Portal Map Pack.
Thanks to Dwango for inspiring me to create this, Maurice for quickly porting the game to LOVE 11.1, WillWare for figuring out why libTAS was randomly crashing, and TurretBot for pointing out I was doing 1-1 very slowly.
If you'd like to do this yourself, I'd recommend installing Ubuntu in a virtual machine, then you can follow these steps: