This game is off to a great start! The character-switching effect is really cool, mechanically and visually. My reflexes are not very good, so I didn't get very far, but I did kill the boss once! (at least, I think he was the boss...)
I definitely understand the struggle you mentioned in the Devlog. When I started my game, the first big issue I had was trying to figure out what kind of game it actually was! The style of game you settled on has a lot of potential, though. And the switching mechanic could lead to some really interesting boss fights.
I'm looking forward to seeing where this project goes!