I play the guitar and it was interesting for me to find such a game here :) Also the story is quite funny.
The graphics is the thing that definitely can be improved here. It was hard for me to understand that black-and-white square is a riff :)
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Thanks for playing and commenting.
Yes, I agree especially compared to the graphics from your game! It was the first time I did graphics and I completely underestimated it. So I kept it simple and stick to very simple pixel art. When I "designed" the riffs I tought of a guitar tab... but I agree that this is not very intuitive but I couldn't think of anything else when I was in game jam stress mode :).