Bugs: When you buy a fish you only need to feed him once. He immediatly gets sick, then eats once, and just grows.
No idea if he is suppose to go from normal ( silver coins ) to Blue crown ( diamonds ) either.
When you drop a second fish in the tank the first fish becomes green again, as does the new fish. Same process all over again
The oister, no idea what it's purpous is but. When you tap on it without dragging to sling shot it it goes .. wacko .. it just shoots in all directions by simply tapping.
When you shoot at 90° the perl gets stuck and you can't use the oister anymore
You aren't able to drop 2 fish at once. You can't cancel a purchase. You cant' lower the number you want to purchase. You can't alter your purchase.
There also is no clue that you have to press L to activate the shop.
And what's the use of the blue shells at the top ?

Some kind of bonus stage somewhere along the line ? ... Just put the shop there and let it be controlled with the D pad and L/R to lower and higher the bid.
It's a great initiative, but still has quite some bugs

I also noticed it just goes at 1 FPS when you play it too long ^^