The fact that I lost your game and then thought "oh no, I've got to complete this one" is testament to how fun this game and the concept is. The core gameplay loop is fun, the art is cool, and I really liked the concept.
My main criticism would be one of balance. On my first playthrough, despite beating the first monster without taking damage, it was impossible for me to beat the second monster because it was just doing more damage than I was rolling to defend. It was only on the second play, when I knew that my armour stacked, that I knew to just build that armour up to survive the next two enemies.
But still, that's balance that is hard to create in two days, and what you have here is just wonderful. Great work!