Agreed! I think the ghost should be usable with the mouse to avoid it being tedious. Also could add a timer into the game for time-trial esque levels.
Viewing post in Spectral Mask jam comments
We was also consider add mouse but don't really have time to implement and make sure it's balanced.
Maybe we will make a post-jam update to add mouse control
You can toggle the Timer in Setting Menu :D, we disable by default to not pressure normal player.
There is also a developer console to playaround with.