No need for the prologue to be listed on Steam anymore! [b][url=https://store.steampowered.com/app/2891310/Genome_Guardian/]Genome Guardian Demo[/url][/b] contains all the same content as [b]Genome Guardian: Prologue[/b], and your save is shared between them. The only reason I (and many other games) had a "Prologue" version was because Steam didn't have great support / exposure for demos - that all changed recently, they've made some great improvements on that front.