I couldn't get much working, I picked up (?) the grave, afterwards pressing one made little blooping sounds but other than that the listed keys wouldn't work with anything I tried. There were also some viewport bugs I think (like the main menu showing up over about half of the screen in both width and height, in the top left)?
The music was nice though!
Viewing post in Familiar Graves jam comments
One O the devs here! The controls are a bit opaque, we didn't have time to implement more straightforward ones. The left mouse button should fire your magic, while the number keys will switch between magic types. And thank you so much about the music, I'm the composer! You can hear more of my work on my soundcloud 🙂 And thank you for playing our game!