I managed to catch most 3 at a time! It's quite challenging for it's simple mechanics! It was hard to understand what to do at 1st, but at some point I realized that I need to keep the fish in the blueish area and avoid bombs :D
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yeah the mechanic aren't well shown, mainly the fish selling mechanic where the next time you press 1 you get the upgrade the fish is next to (if it is next to nothing you get nothing)
the game is currently crazy hard, but we plan to release a more polished version in the next weeks
BTW a friend just managed 31 fish ;)