The bug of missing notes seems to be a flash player fault. I checked the santa rockstar 3 which 2 years ago didnt have this problem, and somehow notes started missing for no reason too.
Higher difficulty levels are better. But there appears a new problem - having to restart from a checkpoint after death instead of respawning where u died is annoying.
too much coins put into cadillacs and dinosaurs machine and this game is piece of cake. No lives lost and j+k used not more than 2-3 times.
Btw needs a bit more dynamic, especially in control and possibility to change difficulty settings.