By the way, after fixing the bugs, I went back and watched the rest of the video. The main inspiration for this game was actually Operius, the official offline browser game for Opera, created by Mors.
That said, I can definitely see how Operius itself might have been influenced by Super Hexagon.
From the very beginning, I knew I wanted to do something with a keyhole. Not just a forbidden door, but specifically a keyhole. The first thing that came to mind was the Digipick lockpicking minigame from Starfield. At some point it just clicked: "What if I combined that with Operius?" And that's basically where the core idea for the game came from.