Thanks for the feedback. It's been a while since I last made a 2D platformer so I need to get the feel dialed in.
Bullets have a quirk to them where the hitbox doesn't activate immediately. It was a quick fix so they wouldn't collide with whatever shot the bullet or a wall right away, but I should have made a better solution. They do have a slightly wider hitbox on top to make them easier to land on, but I guess that's were the slippery friction causes the most issues as well.