Yeah, I more so mean HP. (I've had a couple runs just today where I ended up with so much ammo it literally went off the screen, but by that point I didn't need it because I only accumulated so many upgrades through obliterating the shopkeepers. I did so by brute-forcing the first one with whatever I had, and then just cheesing the ones after with Riches because they don't get harder or have more health later on.)
Also, just a suggestion: maybe some of the extra items and weapons added in the mobile versions could be unlocked first so that unlocks go beyond just more palettes?
Edit: Turns out the border problem still occurs, but only when exiting (and possibly entering) Settings while de-bordered. The solution would probably be to just have the game start up without borders if windowed. Eh, it's a minor annoyance on an otherwise fantastic game.