I'm not sure what you added so I can't quite comment on improvements. I had fun with this though.
I think one thing which would make a huge difference is changing the font from the default. You can grab some fonts free from google, and there's a fair few made with games in mind that you can get for free or cheap on itch (just check licences ofc)
Giving a timer for some of the power-ups would be good. I wasn't quite clear on what the one which makes you semi-transparent does.
I also think giving some love to the art would make this project really shine more. Stuff the stars being 2x1 pixels, maybe a new background would make the biggest difference.