Thanks for your feedback!
Regarding the score drop: did you speed up to 100 at the beginning of the Easy difficulty? I definitely could've done this part of a tutorial more readable, and some players keep flying at 50, while the score is dropping based on ratio of your current and max speed. That's also a bit too harsh though, so plan to change it to be based on ratio between current speed and 100m/s.
Be sure to check music creators if you liked it)