Shadow Requiem: Arise
Watch the full gameplay video on YouTube
The mechanic
The player, Kael, fights through a dungeon with the Moon Sword. Killed enemies drop a soul; the player can absorb it and resummon it as a skeleton ally. It's the game's one strategic decision on top of straightforward combat: spend the kill now, or bank it for a harder fight ahead.
What ten playtesters broke
Naive and deep playtests with ten external testers, logged by severity. Four findings shaped the redesign:
Phantom Trail should make Kael immune to damage while transformed. Against the final boss specifically, health still dropped — a state-priority bug where the boss's attack and the immunity flag evaluated in the wrong order, not a missing check.
Experienced players dashed straight to the boss without fighting anything. Fix: a short cooldown plus obstacles that force a choice between dashing and fighting.
Dying in level 2 meant replaying level 1 in full. Fix: a checkpoint at the level 2 entrance, so cost matches where the player actually failed.
Undercut the exact power fantasy the mechanic was built to sell.
Self-reflection
The critical bug wasn't a logic gap — it was two individually-correct systems evaluating in the wrong order. The highest-severity issues in a systems-heavy game usually live at the seams between mechanics, not inside any one of them.