Didn't expect to see a movement shooter here!
I have mixed feelings on the tutorial, if you are experienced with Quake or other movement shooters, you'd already know how to do a lot of the things that the tutorial is trying to teach you. At the same time, a less experienced player might be put off by the amount of mechanics being taught to them at once, some of which never really got a chance to be used (like b-hopping), and others more important (rocket jumping, since it's explicitly used later on).
The difficulty curve also doesn't really build up to the use of those mechanics, the first gameplay rocket jump challenge requires you to rocket jump 4 times in a row while avoiding enemies that can't be killed. I feel like this is a difficulty jump that wasn't very warranted, especially since you can get soft-locked in that room if you die enough times. Unfortunately, I was unable to see if anything else came after, since I got softlocked in that room.
Regardless, for a first time making a 3D game, it really does feel like a solid movement shooter. It's got a lot of the fundamentals down and even the weird and niche movement abilities, so I can understand why you'd want to try to teach those to the player. The unfortunate thing is that they are inherently a little unintuitive, so it can be hard to directly teach the player how to, for example, b-hop (especially within time constraints). I think the game does as much as it can in that regard.
Overall I enjoyed the experience when I wasn't struggling with the controls or the balancing. The premise and story are pretty cool, even if they stray from the theme of the game jam. I'm a sucker for these kinds of games, so I hope you'll continue developing games like it :)