Hey, I'm glad you enjoyed it! Thank you for giving detailed feedback! :)
So regarding your points:
1. I actually moved the bridge up recently to make it more clear when to hit the notes, but I might look at adjusting this more in the future.
2. That's a really helpful observation, I showed the game at an event last weekend and what I noticed was some people could very easily complete levels once they understood the mechanics. However, some people found it really difficult to complete some of the tracks, even once they got the hang of the basics. I'm going to try and think more about how to balance the game difficulty for different players, as ideally I'd like to have a way for both sets of people to feel satisfied with the game.