For a Jam, this is a very good game, one of the best I've played so far. Love the "Health - Damage" mechanic but I may just feel it a bit to slow, maybe keep the healing cooldown to 5 seconds without taking damage, but after that regen 1 health every 2.5 seconds, that may fix the "hide and seek".
But aside that, the visuals and concept is amazing, truly an awesome job ♥