I actually didn't think I'd enjoy this much at first, since I've already played a few RPG Maker Games, but I was wrong, it was great!
I only managed to afford the hat in the end, spending the rest of my money on two zombie cures, and 4 potions when times were rough. Otherwise I spent almost all of the Morale on Mana, which worked well since they healed each other and did lots of spark attacks.
Personally I would have liked to spend more time buying and upgrading armor and weapons. I also think you could show the next battle or two somewhere, so that we could optimize the party and purchases for different challenges.
Overall you've done a great job. I enjoyed it a lot!