Sensei Starman Plays Castlevania Revamped - Part 7

In which, having acquired all but one of the upgrades, we go back to the beginning of the game and start hunting down all the heart boosts and health boosts we couldn't get to earlier. We then acquire the final power-up, and head on to a battle with Cthulhu. No. Really. He's just chilling in Dracula's basement.