SOFTLOCK: when I got my 4th red bullet, I tried to escape with it, but nearly ran out of bullets. I thought respawnning would either bring me back to the last save point I used or at least refresh my bullets. But lo and behold, I ran out of bullets, and I can't get them back!
EDIT:I had just noticed that I could climb my way up to the roof, which I had inconveniently cropped out. I feel stupid now.