>>5947140
NTA, Ultrakill's creator Hakita acknowledges speedrunning and does changes with them in mind. When fixing out of bounds clips, he preserved the ones speedrunners use and left messages for some. In the dev streams, he also showed some parts of level geometry designed with speedrunning in mind(but they turned out obsolete with better strategies anyway).
But this shouldn't be that surprising considering that this game basically requires you to 100% speedrun/perfect each level to unlock secret bosses.