there is a how to play menu option.
But you have certaily have a point. A Damage preview might be helpfull before you have to choose score.
And the first boss is pretty easy so you might have been be out of luck.
Viewing post in a dicy boss fight jam comments
Oh you're right, if you actually read the how to play instead of only looking at it, it helps a lot haha. My bad. It might help having the different Combos written somewhere visible during the play tho. And showing damage dealt and healing independently instead of combining them into one number, might help making things a bit clearer. Now i like the concept and the strategizing that can go into it, well done.