My best moments in Ikaruga:
ACTUALLY beating it (albeit on EASY, still though, Stone-Like and all)
Getting a B+ on Chapter : 1
Scoring pro-level times on the bosses
Doing all of the above having owned the game for only 2 days XD
I think the best I've done in ikaruga is getting to the level 3 boss on normal... Easy is just too easy.