Thanks for the comment! I appreciate all the detail.
1. There is a scoreboard implemented already. You can see your top 5 scores on the left side of the menu when selecting a game mode. It also shows your relevant achievements for the mode.
2. I've thought about that, but never did it because I think it would make the game too easy if you could just move blocks anywhere. Maybe a mode for the future, or some variant of it.
3. Good suggestion, I usually just hit start + select (end game) to switch songs at the beginning. You can also toggle songs off that you don't like in the settings.
Also, I'm currently working on a proper PC port (and mobile, etc). I have a lot of ideas that I can do when I'm not limited by the GBAs hardware. Looking forward to sharing that progress soon! I'll write posts here with some updates when I have something worth showing