hi! which upper left corner? you mean of the first screen or another? Thanks for playing! Yeah I honestly have no idea how to make a volume pad for a game like this, but hopefully in the future!
I'm into playtesting indie games like yours. I'm working on project of free playtesting platform. If you're interested in more feedback and you're willing to play some games in return, visit my website: test4test.io It's alpha so any comments are welcome.