Honestly, the game kinda strikes me as a bit lazy. The levels are long, slow, and not terribly action-packed. The sprite for your gun and the enemy's is identical, and the animation for running forward and backpedaling is the exact same. The music is nice but a lack of variety makes it get stale. The art is enjoyable and I like the style but hampered by looking rather stretched, like it's out of it's native resolution. Furthermore, from what I can gather of the Greenlight, the whole thing looks almost identical to Battleheart, not to mention a mobile game and not exactly the sort of thing that belongs on Steam.
Too grindy, more or less only linear upgrades, and the enemies aren't terribly different apart from needing a different spell to kill or being one-shot BS. The gameplay is dull and lacks variation in general.