Dragon Fighter (NES) - Boss Rush

no damage
Dragon Fighter (ドラゴンファイター) is a fantasy-themed side-scrolling action game developed by Natsume for the Nintendo Entertainment System. It was first published in Japan by Towa Chiki in 1990 and in North America by SOFEL in 1992.
list of bosses:
Ogre King 0:13
Centipede Queen 1:39
Turtle God 3:20
Machine Emperor 4:44
Bone Lord 6:12
Magus 8:41

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The Main Character looks heavily similar to Dragon Shiryū from Saint Seiya.