As a Quake junkie, this game is just too much fun. Your ability selection is awesome, and the pace is consistent and incredible. I can't wait to see where this game goes.
As you noted, there are so resolution issues that do not impact the game very much at all. I would love to see support for refresh rates higher than 60 Hz in the future; I may be spoiled by 144 though!
A glaring bug I have noticed so far is that, when using the grappling hook, sometimes you can clip into the mountain/hill objects for multiple seconds. While this didn't impact the game in terms of playability, it's very much so a noticeable issue.
All in all, you've done an incredible job with this game. I can't wait to see where it goes!