I need to update the tutorial box in the top right. You use Q to decrease the value of the bar and E to increase it. The value is the volume of the music & SFX. In a few weeks, I'll seperate the volume and SFX into separate bars.
Edit: thanks for the compliment to the artwork, but I don't particularly like it. I might draw some proper sprites when I come back to this project (probably in a few weeks)