Very interesting concept. I won at second try however I still don't understand how the mana relation works and how to beat the game without inflicting any damage. Also please write somewhere that you actually need to find where all the girls are at the same time because I initially thought that I need to seal them one by one and this is why I failed my first run xd.
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To not inflict damage, you would need to dodge or block all the attacks until the magic barrier runs out of power (in 5 minutes real-time), then you can flee. (There is no special or reward in the game for doing so).
I have added a warning to the finality of using the artifact seal.
Thanks for playing.