Salty Assault is one of the three skins released in Nomnomnom Planet event. It could be purchased in the item deal part of that event in late April 2021.
Salty Assault could be purchased for $2.99 in a limited time deal which included a package of 5000 coins and 700 food magnets. It was not available for individual purchase and may not be available for purchase in the future.
Details of this skin may vary depending on location, platform or time.
Note: Salty Assault was released again for a limited time as part of the Nomnomnom Planet event in October 2021. The details of the item deal with this skin remained the same as the original release.