The current build on here is p old now. A lot of these things are wip or have already been fixed/changed. As for the tutorial issue that is a bug we haven't heard of before but that tutorial is being reworked anyways.
Anti-Aliasing won't be added. there is a technical reason for this.
Unless you're playing on an older build the camera should be tied to your current framerate. I don't know why you would be experiencing low frames in the first boss arena if you're not dropping frames elsewhere. I'll be sure to keep an eye out for any issues relating to that.
Lastly jetpack and the dash is planned to be swappable however hover is meant to be supplementary to the rest of the kit. Also there is a reverse jump (similar to how a ground pound would work) already present in the game. though in general everything in the current public build has been completely reworked under the hood as well as new attacks/movement having been added since.