Early in 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.

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The in-game HUD/UI went through many iterations during 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.

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One of the first weapon combo tests w/ Mom's Knife in The Binding of Isaac: Rebirth

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