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some guy on Steam stole your game and slightly reworked an asset or two. and is selling it.

These games have completely different controls, color schemes, game mechanics and you know one has player models and the other is just a shopping cart, but no yeah its for sure stolen despite the fact that the only commonality is the setting and that they are simulators. If you actually play both you will see that "slightly reworked asset or two" would not create the vast differences each game has from one another