This is awesome. Funny how a few people did Greek myth story lines. I like this story and how you have to find your twin. I was a bit confused on the silver version of the character but quickly understood that it was not my twin that I needed to find. But what a great reuse of the mesh and you even added in a bit of AI. Also, not sure what happened, but I lost health on the first silver enemy, then got my health back with a vase, but second silver enemy I encountered seemed to kill me right away. Awesome game though! The maze is definitely hard and love that you added a voice over, which is way better than a simple text pop up.
The ending happened a bit quickly, so maybe add in a delay and a transition so it's not so sudden and the player can understand what happened. A death animation might be good too and might be fun to create as well.
If you're looking to polish this game up a bit, I'd add in some more props to populate the hallways (vase looks good though!), change the health bar to have an image background and foreground and add transitions and additional graphics for the menus. Maybe use the marble material on the buttons with a border or something similar. Also, the walls are a bit thin, so maybe add in another wall mesh that's thicker, just for those pieces that stick out in the middle of the room to give it more depth.
Great job on this!