Ruff1298 said a lot of what needed to be said (so thanks for that) but I'd like to add a few things I noticed + help with anyone frustrated with how to defeat P-Bot (with Salad Fingers):
1. The music is pretty good but repetitive.
2. The BLAM medal still doesn't work (at least for me)
As for P-Bot use Salad Fingers 'a' attack (his fingers become faces) to reflect the missles P-Bot shoots when you're far away back at him. Other than that you use the attacks from the other characters before Salad Fingers to hit x amount of times.
I would like to say, though, that I did enjoy this game but it could have been a lot better with the corrections ruff128 mentioned.