Gameplay reminds of the first Touhou, Highly Responsive to Prayers, but unlike most "[Game X] but with [Aspect Y]" it is very enjoyable on its own thanks to the character/enemy designs and audio combining for a pleasantly quirky experience.
This is amazing for a demo. The grappling hook is just the best thing ever, if this is made into a game i really hope it will be used more. (Maybe even using it on moving targets?)