Fun: Pretty fun, especially for being different from the other games. But it took me a while to figure out I could click on places to go there.
Implementation: The game worked well enough once I figured out how the controls worked, but more clear instructions would have helped.
Audio: The music was sorta weird, especially for the game's plot. The text (and the font it's written in) would have me expect some more traditional music. Then again, I don't really know what Ancient Greek music sounded like, it probably would sound weird to modern-day listeners (it would probably have used low-tech instruments though, this isn't the first game in this jam that makes me think of a lyre, but it's probably the one that would fit that instrument best).
Art: I can see what the images are meant to represent and that's what matters. In fact, I think they look pretty nice. The font also reminds me of the Greek alphabet, and for a moment I thought the game was in Greek, but then I realized it was English (I have been able to read some Ancient Greek, but I'm not good at that language at all).
Theme: It's there, and the pressing space to go back is less annoying than having to go past the exact same obstacles I went past on the way there. And for a timed game of this type, I think that's a good choice.