I definitely see where you're comming from!
The spell system was kind of intentional, it's supposed to make the player weigh if it's more important to have a better spell or to have more hearts. To execute in a way you're suggesting, potions would probably just heal you and spells could be bought with coins...
The enemies I can see as well. Having only two enemies can get a little boring and I would have had the time to implement at least a third one so I guess I just got caught up there...
The boss initially shouldn't even have been a boss but I kinda f'ed up the actual boss and had to change some values.
Anyway, thank you for playing and thank you for the feedback!