I've gotten all the routes, I'm guessing you're talking about the rabbit?
I got stuck there for a small bit I got through it, once you talk to the rabbit and start running down the path you came from, exit the room then go right and up to the top door and enter it, then a cutscene should play out and you're outta that chase!
And if you ever get stuck again you can ask me or look at the guide the owner has on tumblr,they have it chapter per chapter and have a guide to all the endings, I like to do games without any help personally but others like to get help whenever they can/when stuck so guides/people can help a lot.
If I remember correctly I believe it's either Z, space, or shift. You can test out keys until you find the run button since the chase doesn't start until you talk to that specific rabbit so you have time to figure it out if it's not one of those three but that's one of the only times you *have* to run in the whole game