This is a pretty cute rhythm game and I wish you all the best in completing the STEMA creature collector! Some small things I noticed while playing:
At the start I forgot what key was for cleaning the tip, but the game just took one and considered my lack of action a fail. Not having a tip would make the rest of the task impossible, but adding it for the player takes away a bit of the control.
I feel the left/right keys should be switched. Like when the thrash container shows up from the left side requiring a left key for the needed action. There is an option for custom key mapping which is awesome, but a WASD implementation alongside the arrow key would be great.
The last thing is that when you retry the game for the first time a white rectangle covers the top of the screen and you can't see your score. Retrying the game for the second time doesn't start a new loop forcing you to refresh the page.
Making this in a week is very commendable. Good job