Loved the idea of being a vampire bat and sucking enemies to recover or even net-gain some HP; makes wanting to engage in combat more of an interest. There was a LOT of enemies, often piling up into a mob of 20 that would melt me instantly whenever I got nearby lol It was easy to get glitched into the air and not be able to come back down, but thankfully you added a respawn button. The map was VERY large, and the minimalist aesthetic did make it very easy to get lost in, I sorta used the large trees as a landmarks to know my positioning so smart choice with them.
It seems like it was really ambitious, I hope to see it fleshed out. I think if you removed the restrictions of the Jam's theme and kept evolving the ideas, it'd be a fun little vampire combat game! I also loved the art, the 2D characters have a charm to them and I liked the wide range of animals used.