Your renders are really well made. Your game is well-paced, story-driven and overall well written. You are so exceptionally good at what you do, I can barely believe that that this is your first project! Keep it up, will definitly keep an eye on you.
Now, about the Eternum similarities. I'm torn on this. While it's hard to not notice the similarites in the very beginning, you're diverging from it really well and this is no longer an issue afterwards. I think you are well within your rights to take inspiration from other games and your game is anything but a cheap copy. Though as far as first impressions go, it's easy to assume that you're uninspired for someone who is just playing the first 30 minutes. It's kind of depressing that a game of this caliber gets dragged down by good ol' human psychology.
Listen, your game is great. I'd say don't listen to them, but I have to admit that their experience is somewhat relatable. I don't want the beginning to change, but it might also be foolish to not do it. It's a decision I'm definitely not envying you for. Good luck.