Thanks for your feedback. The screen transitions are slow because I wanted them to be smooth, and not just a fish appearing out of nowhere. Horizontal movement seemed right for me this way, because fish can't swim backwards nor can they swim that fast against current, but maybe I can make it a bit more unrealistic for better gameplay. And the scroll speed increases over time, I wanted it to be slow at first so that it wouldn't be that hard in the beginning. I wanted an option to select difficulty, and that includes game speed of course, but I didn't have enough time to implement it. If you have any other advice on how I can improve the game, I'd love to hear it!