Author of "PDF Tetris" here.
Great work! We had the same idea at the same time, here's my version of PDF Doom:
Source: https://github.com/thomasRinsma/pdfdoom
Playable here: https://th0mas.nl/downloads/doom.pdf
Yours is neater in many ways though!
"There was a problem with this document". Is the problem me, or the document?