Played until I unlocked the whole skill tree then my characters disappeared.
In the settings menu you can set the FPS to -1? Guess it's a bug.
When you start the run it looks like you get a free cast of meteor? Doesn't go on cooldown or use mana not sure if that's intentional.
Only think I don't like is the upgrade menu during gameplay, scrolling is too jumpy and overshoots too much. Maybe you could have a tab for each party member's skills.