I enjoyed playing. Good variation in speeds and sizes of the enemies.
I didn't notice any increases in difficulty as time went by. This might be nice, but maybe not so necessary since you only have one life.
The movement seemed a little granular at times - I'm wondering if this could be smoothed out a little?
The window size / scrolling did cause some issues at time, but this isn't indicative of the programming - more the setup in Itch.io.