I mean, I get what you were going for, but this really needs a bit of polish. Okay, a lot of polish. The music badly needs to be able to be muted, as I found the semi-random notes (especially in the second era) really irritating. And while I'm aware that Alt+f4 exists, that's no excuse for not having an Exit or Shut Down option in the main screen.
Mm, and there's a decent game in here too, if a short one. I liked how the eras got faster and faster, mirroring actual historical trends (no idea if that was on purpose but I'll give the credit anyway) and I found the ending funny, if a bit abrupt. It's just feeling a bit rushed... which, you know, it's a gamejam game, they're rushed by necessity :p