Machine gun takes forever to level up and is too much to take care of for me to care. Snake is really cool but it takes 2 of my guns and deals not the biggest amount of damage (which is why you would use blade or nemesis but still...), and the spur takes forever to charge to be too effective. Even when I first played cave story as soon as I started using the machine gun I wanted to trade back for my polar star, and that was before I knew there were more guns, so I went back to my last save which was very far back. When I got the snake all he says is "let me look at those guns" so I wasn't expecting him to take and combine my polar star and fireball. Which again at the time polar star was my favorite weapon, but I still found the snake fun and interesting it just...didnt have much use to me. The spur was an unexpected treat because I hadn't used a guide to get it, it dealt massive damage if you had good timing, but was still of little use... until I got to hell that is, for going through hell and especially Ballos, form 1 use nemesis, form 2 spur hit both eyes with a massive beam that deals massive damage, same with form 3, and use all my super rockets on Ballos form 4.