Impressive, but too much loot.
I stopped playing partway through the fourth level, because it was simply becoming a pain to manage the ton of loot received.
I'd love to see a sequel with scarcer loot on all difficulty levels, perhaps a town to sell and buy equipment, and, ideally an experience system, so that those who trudge through a level eliminating all enemies are rewarded with quicker level-ups than those who blaze through, finding the exit as fast as possible.
As it stands, there's not too much benefit to killing all enemies, because you still level up by going to the next level, and in the time it takes to get a good set of level one rare gear, you could have a better set of level three uncommon gear.