I have put in over 200 hours, I'm level 200, and i've caught over 8000 fish. I like this game. I do have some critiques. I did get to the point where I could no longer buy anything from the store and that felt really early. Now I just accumulate money with no way to spend it aside from the mouse store.

I have caught over 8000 fish, only 2 have been shiny. I think this is pretty crazy that the rates are this low. I do buy everything from the mouse store every time he comes and I usually have 4 to 5 potions going at once.

The catch rates for some of the fish needed for completion are way too low. Again, I have spent a long time on this game but I can imagine that for all the fish to appear to complete the achievements it would take thousands of hours.

I suggest to keep the game more playable for the long term:

Make a math-based increasing store and leveling system that allows you to continue progressing and improving.

Add a fishing speed upgrade that works to also decrease bite times and catch times.

Show a timer for when mouse store will return.

Show catch rates for each fish.

Show before value and leveled up X value for fish. Example: Bass (Level 3 X 1.3, Shiny Rate X 1.25) or something.

If bite time is fixed a timer for that would be cool especially if you could improve it over time.

For example an ideal 300 hours progress for me would be: I can now hold 1500 fish in inventory, my bite times are now once every 3 seconds, I see that Bass is level 13 and I earn 130 bucks for it instead of 10. I am saving up for the 2.5 second bite time upgrade which is 1.7 million. I have purchased auto catch for A-D tier fish. I have purchased auto sell for A-D tier fish. I have potions that let me catch 2 fish with one catch. The mouse shop is always present and I can buy any item but their costs go up each time and get reset every 24 hours.

Fish love me, shinies hate me.
How can I report the rat for market manipulation? There's no way he only had one legendary potion on stock in 100 hours.

Just kinda sits there and that is awesome. Click the dots if you want, dont if you dont. Make it really small if you need the space, make it really big if you wanna look at it.