That's a really nice one, and fairly well polished too. Short and sweet, as the wise would say. Feels awesome to just waddle my sword while running into stuff until they die, specially after I just bought 5 strength upgrades and mowed everyone on 2 hits. The mere action of slashing just feels so right here really, to the animation to the sound effect and to the impact and weight of every hit, really makes me feel like the master of blade waddling. When it comes to gamefeel in general you really knocked it out of the park tbh, congrats on that!
Visuals are also really sweet, the animations specially are really top notch. Music is also pretty viby and fits well, altought I have to admit, I closed the game 2 mins ago and already forgot how it sounded like, but that's more because atmospheric music is just not my cup of tea anyway.
The bosses are also pretty nice, they really capture that Hollow Knight/Dark Souls boss feeling. Altought I need to be honest, they both kinda feel like they have essentialy the same moves, the Demon General really feels like just a "Big Dude Tier 2", so if he had some more different moves it would have been nice. (But that can be bias too, I'm way more of an apeshit platformer guy than a souls-like guy, so my ideals for good boss design are also kinda affected by that I guess)
Now to be more nitpicky tho, I really hate when games doesn't use the "UP" input (in this case W) for anything at all, but simply decide to put jump into the spacebar for no reason. This is really just personal preference, I can get over it, but it bothers me still (Not the end of the world tho, heck, the very entry I worked on also commits this sin xD). The level design of the hellish area could be better too, for now it's really just a lot of blind jumps with the risk of falling on lava.
I also had absolutely no clue what the blessings deal were, there's nothing on the game explaining it, and the page said they're "equippable" but there's no input listed as to how to equip them at all, so I didn't use any.
I also assume the Demon General is the final thing you face, because after that I tried to re-explore everything and didn't find anywhere to go with the double jump.
Oh yeah, almost forgot, but I also really appreciate the amount of secrets you added. That's kind of a very important thing to metroidvanias but very few entries to this jam actually do it, so that was a nice surprise :)
And I guess that's all, I recorded my playthrought too so if you wanna see it just ask, but I think there's nothing super interesting on it tbh.