Played on macOS, not a problem after following the instructions below. This is a really impressive game. Super small file size and lots of depth and polish. I kept getting surprised at how many features were packed into this. It's hard to see the relation to the theme and the visuals are pretty cool, especially when it comes to some of the spells involved.
Really wished there were more indicators on what effects were on me, or where the fireball was going to land, etc. The game is also insanely hard. But that only means there is so much depth.
PS: Thank you for the vim key bindings lol