>>14242
I think if we talk about this kind of game where visuals are primary concern image quality should be most important aspect even if this will make it not very responsive.
Without all those features it will be just another FPS with little value.

I do not expect OP to implement all that, but what I say is that it is just not so hard or impossible as it was said before. Unity is not that bad as it is often stated here.

It seems to be totally possible to replace his low poly models with something ultra detailed or just throw in some readily available environment.
What has the highest value in this game is all that logic and physic which could allow those advanced actions to happen.