Just want to note that the Japanese name for the move Splash(はねる) can also be translated as “hop” or “jump”, which is why Magikarp is known for jumping in Japan and why this game exists.
I also want to note that Magikarp is known as the weakest Pokémon, not the worst, although even that is debatable depending on how one measures strength.
It’s super charming! It’s a pretty basic clicker, but it’s got a cute art style and it’s fun to hop into quickly when you need to pass a couple of minutes or take your mind off things.