It's a cool idea and I like the graphics, but the stages is quite static, it doesn't get more difficult with time. The easy is too easy, and the 5min gameplay is too long for that (in my opinion). Maybe making it getting more difficult with time would make it more dynamic (like the swimmers increasing the speed that they appear).
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Thanks for the feedback, Afaranha! My idea was to put animations on everything, but I wasted a lot of time solving bugs and I couldn't do it. Haha... The balance was affect by that too, so I couldn't analyze if the 5 minutes was too much, as well as adding more variations and difficulties. in the end, I ended up just delivering the basic concept, but after I'll redo everything more balanced.