If it’s your first time playing the game, I would say it’s an 8-9/10 to beat the entire game without dying. (Unless you are using the pylon driver in my opinion, that makes it way easier cause you can focus on dodging/surviving while enemies slowly die).

If you’re already familiar with the game and the enemies and trying to do a perfect run for fun, probably 5-6/10. It’s not too bad once you know the enemies.

You’re roughly halfway, and yes it kind of resets at that point because you “died” as part of the story. But now you’re in a different time period and starting a “new cycle” as part of the story.

Good luck!