I’m still kinda confused as to what happened…
I’m looking at videos of the 4 different endings…the little AI boy gave me 2 choices…destroy or control the reapers…but technically speaking I didn’t see any choice paths…I do remember while speaking to me, I saw a memory/flashback of shep shooting a tube next to the crucible light…so I limped toward the tube and shot it up releasing an orange glow that engulfed everything…I see it on IGN listed as the “perfect ending” but I don’t see how he could’ve survived that
I don't fully remember all the endings but I'm pretty sure it's based on military strength and you have to
destroy the reapers for shepard to live
Thinking back, every time in the series you have a chance to kill synthetic life and you don't, you get punished for it