So I just went back to collect the pickups that I missed. Got 100% completion on sector 2, went back to the main section, and noticed two more on my map that I hadn't gotten.
So I'm a walkin' and a mindin' my own business when I see a power bomb area in the wall that doesn't seem to lead to either of the pickups in question. I bomb it, go through, follow some paths, and the next thing I know, I'm fighting some enormous giant alien eyeball thing that was awesome and insane, but also disappointingly easy. Fun battle though...it probably ended up being one of my favorites.
But then I initiated a cut scene after beating him, the Bottle Ship exploded, and the game ended. Was THAT the secret ending, or do I get still more if I go back for 100% item completion? (I finished this time at 70%.)
I knew there was an extended ending, but if I've seen it, then I won't drive myself nuts about getting the 100%. Especially if all that's left to unlock is a hard mode I'll never use.


Same here.