This was really fun! The art is excellent, felt very polished. The sound effects were also amazing, added a lot of immersion to the gameplay, and the music really built the atmosphere. It was well-lit, not hard to see what was going on but the moodiness of the slight shadows was nice. The animations were ace, really gave the attacks a feeling of oomph.
The balancing felt good for the length of the game, I enjoyed getting to see how all the upgrades felt. I also felt like it was a good length, as I got to explore the gameplay loop a couple times without feeling like there were too many waves of enemies, definitely left me wanting more, which is great!
The theme was really present and well-explored, being able to slay your last host after leaving them made it clear how inconsequential they were to you in the quest for freedom! At the same time, keeping the skills you learned from the previous hosts was cool, it made me excited to find a new host as I was gaining new things without losing anything.
I agree with the other comments saying that the directionality of where your character was facing/would swing was a lil' hard to intuit, although it didn't really affect my enjoyment in the short run. Other than that, everything else felt super clean, and easy to pick up.
Felt like a really solid foundation, that could definitely be expanded to include new hosts or enemies! What will the Blight Blade do upon escaping the tomb, I wonder?? Great entry, awesome work by the whole team!