Daioh is an arcade shoot-em-up made by Athena in 1993. It notably features a multitude of waves of different enemies, several final bosses and frenetic action. Also notable is its ranking system, which can result in enemies shooting bullets at an insane speed.
PearlASE completes both loops whilst reaching the counterstop of 99,999,999 points, with a real final score of 108,362,740 points. The TAS also masterfully shows off how tough the game can get.
Note: The TAS lets the demo play to manipulate an extend in Stage 1. The gameplay starts at 1:27 in the encodes.