So! I saw Tomer's comment mentioning getting stuck on a treasure chest. I didn't remember seeing one and got confused, and booted it up again. I now realize the key is randomly placed. I just happened to, in my run, have it spawn at the first possible location, so I beat the game in two seconds. But it turns out there's a good bit more to the level, and even at least one enterable room to explore. So I retract my comment about how short it is!
If there's anything I would've appreciated, it'd be a hide mechanic. Pumpkinboi is faster than you, so if you get stuck out on a long corridor with him chasing, you're just doomed. Unless there's a sprint, or there actually is a way to hide, that I missed. I didn't see a list of controls on the game page to confirm/deny.