Great question!
First off, I'm not a lawyer, so my advice comes to you purely from my own understanding. I do not provide this advice with any warranty and cannot take responsibility for any legal issues you may or may not encounter. That said:
As long as you don't claim them to be LEGO bricks, you should be fine. They could just as easily be depictions of LEPIN bricks, MEGABLOCKS bricks or Wilko's offbrand LEGO-compatible brick. (Though we all know that LEGO is the superior plastic construction block).
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Ok thanks, I was thinking of making a game that is in the LEGO style that is reminiscent of one of my childhood games, so I was wondering. Thanks for the help. Your asset is great, and even if I don't end up using it for the game, I might buy the sprites just to see the style - that is when I actually have money lmao.