Why Dead Cells Bet on Haxe and Heaps.io: The French Niche Stack Behind a 10-Million-Copy Roguevania

Why 8-person co-op Motion Twin built 10M-copy Dead Cells on niche Haxe + Heaps.io instead of Unity, what owning compiler plus engine gained and cost, and what indie devs can steal about fast iteration, cross-platform C/JIT, and toolmaker culture — with original analysis and open questions.