This link is free of all the other junk on the page and seems to come straight from the source (you can even change the url from 1.0.7 to some lower numbers to access earlier revisions of the game), so I'd recommend using it: https://cdn1.edgedatg.com/tml/apps/dnow/games/games/game-owl-house/1.0.7/index.html

Oh wow, looks I've been resting on my laurels and ignoring this speedrun for too long; I didn't even notice someone was coming for my time until I got an email a couple hours ago saying you beat my record. Looks like it's back to the grind for me.

The only difference between sites is how they frame the game. They all pull it from the same source, where I play it through: https://assets.games.corusent.com/wp-content/uploads/2020/01/game/1329/owl_house_build/index.html