The different types of weapons and learning about which was best to use against each enemy type was engaging. The art is super cute and I loved the music and sound effects as well!
I liked your take on the theme, though as it is right now it seems like the best strategy is to open all the doors on each level in order to find the best gear possible, I would have loved some kind of incentive to take the ladder earlier, so you'd have to make a choice whether to stay or to go to the next floor.
Overall fun game, stacking a ton of armour was very satisfying.