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Early in #IsaacRebirthDev @edmundmcmillen wanted an epic final boss that would be locked behind a puzzle. So the boss had to be awesome!
It took over one month to implement Mega Satan and all his phases, but it was worth it. He was a lot of fun to design.
The in-game HUD/UI went through many iterations during #IsaacRebirthDev. Here are a few of the designs that were considered. The differences might seem subtle, but there are specific design reasons why we chose the final design.
One of the first weapon combo tests w/ Mom's Knife in The Binding of Isaac: Rebirth #IsaacRebirthDev