It is what it looks like... a fishing simulator that is more into completive sport fishing, rather than casual or leisure fishing and commercial fishing. Controls were actually a bit more challenging than I initially expected, and the challenge of fishing itself takes some skill.
Like most fishing simulators... and actual fishing itself, players need to tire the fish out and then reel it in. There's a gauge to see how weakened the fish is.
Gameplay-wise, it's a bit monotonous, and battling different species feels more or less the same. While other species are more challenging, they all more or less feel the same, from bass to marlins.
For graphics, they're not bad. In fact, a bit above average for a mobile game. This adds to the overall score, but does not necessarily make it good.
Overall, it's an OK game. It gets monotonous real quick, and maybe need a few tweaks to make this actually good.