The funny part is that originally it was planned to have weapons swap out like in old arena shooters. Due to time, misunderstandings, and some scheduling issues, it was never added in. Furthermore, an idea was thrown around to literally fight cupid as a boss, but, again, we never got around to it.
Notably, for some reason, health wasn't really thought about. I don't even remember it really mentioned much until the last few days. Health [for both the enemies and the player] weren't really things until the last few days as previously the death for the hearts was instant death and Dupic didn't even have death yet. I have an idea of the reason, but it'd be best to ask Avace on this one.