Dead Cells launched in early access in 2017, and developer Motion Twin's brilliant mashup of roguelite and Metroidvania quickly found an audience. It was an excellent game when it launched, but its subsequent support through the early access period and beyond has been exceptional, and mostly free to boot. Most recently we were treated to the wonderful Castlevania DLC and there's no sign of slowing down with its current developer Evil Empire...
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Dead Cells sells over 10 million
Source: PC Gamer (opens in a new tab)