Hi Hayes. Nice to read from you. Thanks for your comment - and great feedback. Please note that you have a little bit of time after the note hits the center of the arrow until you missed the beat. So better be a bit too late than too early. It might make a difference. The songs were intensely tested by the team and it is normal to fail the first 10-20 attempts to play through a song completely - it's part of the challenge to train the memory muscles a wee bit. It's really easy for me to play through all the songs now.
I understand that the steady energy drain can be mean if there are no notes coming in. But every song can be done with enough practise and concentration. Regarding the lag - depending on the environment or number of beers - would suggest an option to adjust the precision. I'll think about that.
Bummer about the bug. But thanks for letting me know.