See that's not enough for me, because it's highly unlikely that anyone who has spend half an hour fishing will have a problem hitting the button at the right time. And once you've levelled to 50, you could literally do that while watching TV.
It's why I suggested a randomised response request after a randomised amount of time with a strict time limit for the response. Sure, if you've played for 50 levels, your reactions should be somewhat honed, but the response you have to give is unable to be predicted and your brain has to do that little bit of extra work to recognise the required command and tell your fingers to move to the correct place - each and every pull is different (er, unless it's randomly the same). It's more like a brain-training exercise and yes, is "more stressful".
Just saying that, imo, pressing enter each time the fish bites is akin to not pressing anything at all, from the perspective of brain action. Either it should go one way, with no action or go the other way, with an actual minigame, but as it was is less fun that both (imo imo imo)
