Definitely a huge improvement from your last game. Though the graphics are quite simple and the background is bleak it makes up for the fast paced game play of trying to defeat a relentless onslaught of square demons with a rather creative array of weapons. The fact that they spawn randomly at a time seems without acquiring a pickup item seems rather unique as well especially with the fact that whatever weapon you get comes immediately giving you little time to handle yourself against the demons.
Out of all the weapons I'd say my favorite is the bomber since it leaves you a path to travel past any other demons and my least favorite is the four armed demon since my cursor is always on the outskirts of the map XD
But overall great effort! I hope to see an update or a DLC for this sometime soon.