Any chance of another ending?
I maintain that the third-act twist should have been that Jimmy's using his classic-portal-fantasy-meets-It's-A-Good-Life powers to paper over his parents' divorce - the dog is clearly something Helga got to make her residence unsafe for Andy, rather than an aggressor in its own right - but rewriting that much would be a huge amount of work, and regardless, basically anything would be better than Keep Playing Forever Or Die.
(Something something Jimmy's powers are a reflection of him using his cancer as a social bludgeon to make his family pretend to get along, so he's as afraid of waking up healthy as he is of dying? Feels like there's something there, anyway.)