Thank you so much for your feedback! Sound effects were the next feature planned, but I took so long to bugfix after the game was "complete" that I didn't have time to create the soudn effects... About that panel, it exists, but I don't know why I left it invisible(?). Looking back, I took a lot of stupid design decisions somewhere in the middle of the development. hahahaha
Then again, thanks for the feedback! I'll be sure to leave one on your game soon too!