I Felt SOOO overpowered with the shadow warriors!! It was so satisfying filling the screen with bullets and destroying everything. That's an awesome feeling to achieve on a short jam game!! Nice work
However Im not sure it really fits the theme, or works very well for it. Blood magic feels like an afterthought to the core game here. And in general, blood magic is usually not very impactful or fun most of the time I see it anyways. There needs to be a lot of HP loss and gain rapidly for blood magic to feel fun IMHO.
In any case the shadow warriors are AWESOME. You don't usually have direct control over shadow warriors in games, so that was kind of a unique angle! Excited to see if you take this idea further!