You can use and modify these sprites to be used in commercial games, but you need to credit me (Pop Shop Packs) and note if you have modified the sprites. You don't have to include this credit in your game, but it does have to be available for players to see if they want to know more about the development of the game (Such as on the game page in itch.io)
You may not redistribute the sprite sheets themselves. Any individual who wants to use these sprites should be directed to this page on itch.io to get the sprite from my shop directly. (In other words, don't take these sprites and sell them on other websites)