I think you should change the gem chance to work with auto clicks and not the manual ones.It is not worth it to click for gems when you have a good auto setup.
Here are some of my ideas for a sequel(Please,do a sequel) or an update for the game.
1.The fishing mini game should have different types of rods, say an auto fishing rod,a rod to catch certain types of fish(Goldfish and Whale etc) You could do some sort of combo system so that each fish gives you more xp.There is no need to catch Snails from fishing once you get the Snail Farm so if the snail was not catchable(i know it is not a world lol) you would have a better chance of getting the better fish.
You could make the rods upgradeable to give them a better chance of getter rarer fish,especially the auto one.
2.What about an upgrade so you get more exp from the bar each time it goes up.48xp is awful at level 44.You could have different levels of peguns to buy,the max being an emperor penguin of course.Let us up grade and or buy more cloths,that way you could put more effects onto them.Maybe you can get a hat that gives you 5 times your xp form all places?
I would love to see a sequel to this great game. Perhaps we could have different main turrets that we could upgrade as well,like a laser,mortar and minigun/machine gun turret.
Great game but as others say, its a shame you must pay to win and so on. I really wish there where more ways to get balens instead of the insane prices you want for them