Lovely game for a first go! The theme adherance is good, though some things you mention in GDD and game description aren't in (cost of sanity?). I hade fun dodging the arrows and swords.
I couldnt find where the time ability applied-
My main critiques are: Too smol! I cannot see the detail of the characters or enemies very well. If you made the entire game twice as big it would help a lot.
The mouse to pick up hearts was finicky.
Big one: If you get MORE hearts for your diety, it fails you. So, make sure the heart requirement uses an >= operand.
I love the destructable fences. Nice touch