While waiting for Gas Station Simulator’s prologue to arrive on 28th April, you might want to check out the game’s demo. It’s a different experience from the prologue, because the prologue has you establish the gas station from scratch while the demo throws you right in the middle of it with an already set up gas station you have to run.
Both the demo and the prologue show parts of the full game that will be released soon. Combined they are meant to give you a very good impression what Gas Station Simulator is about so that you know what you will get once the full game is released rather than buying a proverbial cat in a bag.
Go the Gas Station Simulator store page to download the demo: https://store.steampowered.com/app/1149620/Gas_Station_Simulator/