Describe a thing in an indie game that would make a Gameplay poster's head explode
I'll start
Sproggiwood: AoE hard CC on ranged autos.
Desktop Dungeons: Lifesteal scales with level instead of damage output, making it appealing to resist-stackers.
FTL: Permanent AoE regen that can outheal enemy dps.
Undertale: Being expected to dodge skillshots.
Binding of Isaac: Autoattacks are replaced with Xerath ults... and many other things.
Nearly all of them: percent max health true damage.