The shrooms falling was a cool twist. And the visuals felt like they could definitely be an Atari classic, but in modern times. Aesthetic was spot on.
The one suggestion would be implementing a lives system. It was a little rough having a one hit kill. Just personal preference, of course. I also noticed a subtle issue with the centipede's movement. But with how much you have to focus on the shrooms, I think it was masked well.
Those two asides, I think you did a good job with this. Nice work!