I was trying to work out how to describe different categories, but I think you got the good example for an any% run. The 3 endings are:

1. The Normal Ending - Reaching the first Game Over screen with Red.
2. The Invasion Ending - Reaching the credits, which you just did.
3. The Glitch Ending - The whole debacle with Missingno.

I'll go ahead and make the category now, and you can resubmit your run over there. Thank you for your understanding.