Functions parties need:
1. See the counter for everyone in that party, so you will know when to swap zone. It can be quite frustrating, perhaps you are the only one online, and the asked you to keep them progressing. You'd have to guess, and end up with an error message.
2. Possibillity to either name the party something, or have a button toggling wether it's a progress through/grinding party.You might be asleep, but are grinding a zone either for cards or xp/gold. Then suddenly a player joins the party, and goes progressing through. You can't change it because you aren't online.
3. Adding "zone caps", so you won't have a player joining in which is a world behind, dragging you behind. I, personally, got stuck on the 10-10 to 10-25 zones for quite a while, because there weren't enough parties so people just joined the highest they could find. The time it took me for people to stop leaving the party and new joining, I could've gotten to the end. You can make it toggable.
For a sequel, you definitively need to have a sort of upgrade system for the fishing rods. Like add durability to it, and then add some upgrades to upgrade durability (and if it breaks you have to repair it), upgrade bait, have different kind of baits, one for whales and one for goldfish, and perhaps a sort of screen so you can see the fish underwater, which also could have upgrades.
You could also add some different rods, one for small fish but often, one for big and rare, customizable rods - and have these higher tiers or be upgraded.
And to sell the fish, you could try make it so we own a shop, and the stock would be fish (and/or whatever else would be added), where we decide the prices and opening times, but need staff in the shop and these factor the amount of sales and money you earn from fishing.
Gosh those metals must be so cheap.. They are impossible to run out, vein keeps on going and going... 100k copper and still as full as it has ever been
You should make a shop for fishing(or update market) so you can buy fishes and fishing rods,
the fihing rods should make it faster to get fish or make it more chance to get just 1 type of fish(like a whale rod makes more chance getting whales)! +/upvote this so creator can see it please!
 "Idle Online Universe"){kind=icon}
 "Brazen Clicker"){kind=icon}
 "Burrito Bison"){kind=icon}
 "The King's League"){kind=icon}
 "Road of the Dead"){kind=icon}
 "Pingy the Ping Idle RPG"){kind=icon}
 "Idle-Tower"){kind=icon}
 "Woodclicker"){kind=icon}
 "Idle Raiders"){kind=icon}
 "Red Remover BLAST"){kind=icon}
 "Pixelo"){kind=icon}
 "DuckLife"){kind=icon}
 "SCGMD4"){kind=icon}
 "Ninja Hamsters vs Robots"){kind=icon}
 "6 Differences"){kind=icon}