WASD should be working, so I'll have to check why it didn't work for you.
For the coins, you actually get one coin for every fish you shoot, plus an extra coin for getting a 5-fish combo, and another +1 if you go above 5. So the reward isn't only for completing a combo.
What would you like to see explained more clearly in the tutorial? That would help me understand what part is confusing.
I agree about the transitions — they are too long and I'll shorten them. The first-day timer is also something I'm looking at.
Thanks for the feedback!