Amusing as always. I know it is ultimately a joke and the punchline is really great, but I actually think the simplicity of the mechanics actually really complements the game at a narrative level, and there is an interesting story here in the environment about time and the scale of things.
my only feedback is perhaps you could provide a clearer indication that we did in fact reach the end, because after the first screen I thought I messed up at first, but then again perhaps that just makes it even more amusing.