This is one of those games that REALLY need more sound work. Even for a quick demo, I'd super suggest taking some time to get basic sound effects, because I can totally see what you're going for and how much work and care you put on the cutscenes and action. 3D games are super hard to make, especially to get right with a low budget, so I'm quite impressed with the scope of it all and it's ambition.
Currently, I think the game lacks a ton of polish— sadly this is also one of those games that, since you're going so far into everything and putting so much work, the lack of polish shows even harder. Things like the aforementioned audio, the simplistic UI and placeholders detract from this harder than from a worse game would.
I think you have a great game hidden away waiting to be constructed in the future, but the way there is gonna take a long road to get to. Don't get discouraged, and I hope that in a couple years this turns into a super polished indie game!