Retro-style RPGs like this are my jam!
Overall Fun: My favorite thing about this game is being a braggadocious, glory-seeking hero. :D Plus, the mythical ancient Greek setting is fun, and so is the dialogue. Unfortunately, I'm finding it difficult to progress through this game due to balance issues and level design bugs. (My current status: doing a second go-around for the sake of level grinding, but now stuck because it seems the button that opened the route deeper, also closed off part of the loop.) If those issues were fixed, Overall Fun could easily be a 5 out of 5. But as it is, I didn't get the chance to experience much of the game. It's a shame, because it seems to have much to offer.
Art/Graphics: I love the retro look, and the enemy art and character portraits are great! I agree with others' comments that making the bright grass green less saturated (maybe aim for a light spring green instead of the current neon green) would be an improvement. Redrawing the hero so they don't look quite so flat from the side would be good, too.
Controls/UI: The UI basically does what it needs to. My biggest ask would be for a quicksave: not for save scumming purposes, but so that I can save my progress and exit the game mid-dungeon when I have to go do something out-of-game.
The item descriptions are informative and often funny. They could benefit from giving more details on some things: how much magic or life an item heals (even if it's vague like "a little" or "a lot"), seeing a more complete breakdown of which stats a weapon or armor increases before buying, etc.
Sound/Music: Fits well with the aesthetic, and some of the tunes are quite catchy! My favorite music so far is Thebes, and the slime dungeon. My one complaint is that the music and sounds aren't all matched for volume. For instance, Thebes' music is quieter than most other sounds and music, and some spells and buffs are too loud. I had to adjust my volume between areas so that I could hear the town music, and not have my ears ringing from some in-battle sounds.
Overall, this has the makings of an excellent game, and just needs some rough spots smoothed out. I'm glad I got a chance to play, and hope to play again next version. :)