I think the art is very cute—it reminds me of Scott Pilgrim. I like the idea and gameplay. The player movement and controls feel good.
Like trashmonger said, I also found it difficult to swap bodies during combat, especially when multiple are stacked together. Sometimes they would become invisible when I turned into a parasite with no host, though they reappeared upon switching to them. Also, sometimes I would switch to the parasite when I wanted to take over a body, so maybe there could be different controls for infecting and leaving or larger hitboxes or something.
I was not able to survive past the popo, but I would like to see what the characters and enemy mechanics past that are (if there are any). Overall, I enjoyed the gameplay despite the bugs.