Tbh, this old version of your game https://gamaverse.com/goose-vs-marine-apocalypse-game/ was better. First, is because it bugged only when i reached 17th level (shots started to kill some out-of-nowhere shrimps, but no visible enemies left on the beach). In enhanced version presented on this page, new shrimps stopped appear when i cleaned the area only on 34%... Second complaint is that when players not allowed to hold left mouse button, they can't really know weapon's attack speed after each upgrade, have to spam-click for each shot. Third, minor complaint about this version, is that neither of 3 choices to upgrade get highlighted when cursor is over them. And here is one suggestion for new version of your game: how about shotgun becomes available only when player kills first boss (some fat fish, which simply ate a crate with shotgun), and later, on lvl25 or smth, 2nd boss (slow octopus) appears, who ate automatic rifle (with much better attack rate)
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Only on 3rd try i didn't stuck on first wave, and met the crab king. Really nice looking boss, but i think you should rework him a bit. Because green blob on his back looks more like some "megaheal". If you change blob's color to red (violet for the rest of body is ok), that'll change the perception of him as a last boss, responsible for the Marine Apocalypse. And shouldn't the boss with name "Crab King" be 2 times bigger? Also, for now crab overlays shrimps, walking above them, instead of pushing the crowd of shrimps away