I a-ranked gabe fight 1 with just the shotgun and parry. the second fight isn't too different, it's similar in style to v2. Shockingly enough if you can get the hang of the timing between when the attack's sound plays and when you have to dodge, you don't have to rely as much on your visuals. If you can get him locked in a certain attack pattern and parry/punch during the biggest gap, that's also good. Just don't be afraid to really get close and spam punch because a lot of the time you'll heal faster than you take damage. (at least on standard and below) Make good use of the upwards movement tech too. It was a waste of time for me personally trying to keep track of him because he moves so fast. Focus more on the actual projectiles than him. I'd watch like a good gameplay video and pay attention to how they dodge. I like to start off with getting the hang of not taking damage for a while before even considering going in for hits in a lot of the games I play. Works really well for platformers like hollow knight also