Gave it another shot, same result. It doesn't help that the fish are the same speed as you, so there is no way to ever catch up with them. I chased one all the way off the map. I can sometimes "trick" them by moving a different direction then swinging back, but never once has the S button worked. The movement of the arrow is too imprecise as well, it's tough to get a perfect angle on the fish. Let me know if you plan on updating after the jam, I'll give it another go.
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I don't know what else to do.
Here's a gameplay footage I recorded from itch page for LinkedIn. The goldfishes are only half your speed, so that you struggle to catch up to them, but you ONLY need 1 goldfish to sink anyway.
Besides, the goldfishes need to move, else if there's a piranha underneath you while you consume a goldfish, you may land on piranha.
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I failed to explain that which is my fault, but the core gameplay loop works exactly as i intend, on my end at least