I've just tested it on safari mac and for me it works.
When you click a body part does the frame of it go brighter?
When you click the runes in the inventory does anything change? Like the number of runes in the display below the rune circle or the design in the rune circle?
Which version of Safari are you using?
Viewing post in Sliver jam comments
Ohhh no I am not! I thought I was clicking on like, the arm, because the sprite doesn't have an arm so it made sense to me that I'm selecting an arm to build them an arm? I'll try again. Think the UI could do with being a bit clearer for that as I think someone else had similar issues figuring it out!