i was confused at first, but when i played more rounds i eventually got the gist of what to do. it is a very cool concept and the interface looks simple yet effective! i also like how cargo can also return with evil submarines, further conveying the theme further apart from identifying lifeforms. however, i was not able to beat the game due to the orange turrets (there were 4) taking my cargo when i needed it most for upgrades. overall, really good game but in my personal opinion i think it needs some balancing changes (or i might just be bad at strategy).
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Thanks for playing the game! We tried to make the game more challenging at end, but we get your point. The orange submarines are a difficult enemy, you can prioritize killing them with the left mouse click. Another approach is to upgrade the gun (not max) and at the end completely ignore the orange subs to destroy the damaging enemies. Both strategies are viable and can win the game.