I think there should be a pause menu so we could change volume settings while playing. It's kinda stupid that I have to die or press windows button to lower volume.
Also, dodging things is very hard and unclear sometimes. Maybe some kind of dash ability that would give you i-frames would be nice.
And my last thought. Maybe those blue things flying from enemies should not be required to change location or summon boss? The game rarely allows to kill an enemy without taking damage and even if you do kill one, there's still a chance that you won't progress any further. My suggestion is to make every single kill increase the count and to make enemies only drop healing things (and money, if/when it gets added).