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The collision detection does not work very well, especially with bigger fish. I don't know exactly how the game works of course, but it feels like a too big \Delta t.
Furthermore you might want to consider making it a bit easier to start off the game by having the size distribution of the spawned fish depend a bit more on your own size, and maybe a bit less fish.
Other than that, good. 3 for now, but I do hope you'll make it a 5. :) good luck :)
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and then there comes a point where you are too big to move... around 4k... then it finally glitched out at 7470.6... yeah... needs a lot of work....
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I think the hitbox for getting eaten should be the mouth, not just any part of a bigger fish. That way you could approach from the rear in those uncertain cases. I also think the screen should wrap and you should be able to reach the edges at any size. Other than that, I like this game's crude simplicity, makes it more compelling somehow than other fish eat fish games. Advice: Start this game with a nice clean monitor, any speck of dirt can fool you while you're still eating small!
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Collision detection needs additional improvements, fish can spawn on game field with out starting at edge on occasion typically = death. fish can swim out side of play field. 2/5 until these are fixed once fixed could be 4/5
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bug sometime you eat 1 px fish and it kills you I like fishy games but have so much on the screen at once is a bit unpleasant, also the color combo is difficult to see. try yellows and blues to create better contrasts.
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Needs... mouse control, music, sounds, fishy animations, levels, win/loss announcements. Just to get your started ^_^.
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The art is kinda dreadful, the gameplay is simplistic, the definitions are mediocre, but it's kinda fun...
--When you're comparable to another fish, it's too hard to tell who actually is going to win, and i wish the fish on the sides didnt 'pop' on the screen and rather scrolled out a bit, but it's still kinda fun... I think i'll spend more time playing it than i'd care to admit.