hey the art style looks like it is from modd.io great game art is great gameplay is great
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The art is from https://www.kenney.nl/ specially from the "Racing pack" https://www.kenney.nl/assets/racing-pac under license "CC0 1.0 Universal".
Kenney is a well know free assets web used in a lot of games, this is why the style looks similar to a lot of other free games.
I recommend it if you are looking for good free assets.