Hi! thanks for playing our game and your feedback. There are some things/mechanics i would do differently now but how it is right now was our first thought. I see that we can improve lots of things.
In case of the shop there is a "?" button in the top right corner which will tell you what every upgrade does and it also says that you can dash with rmb, maybe you oversaw that? :)
I know that the options menu (including the volume settings) isn't as good as i wanted it to be but, well, time was an issue and thats definitely on my bucketlist to focus on for my next game.