I've unfortunately seen a few games with a very similar mechanic.
In general, I agree with most of the comments you've gotten already.
I'm not sure if I missed the point or if the 'tips' were supposed to help me know what keys to press, but yeah, I feel like more sneaky hints for each key would have been appreciated and possibly fun to make!
My team's gmtk2020jam submission:
https://itch.io/jam/gmtk-2020/rate/697372