This one has a lot of promise - the visuals are really solid, and the first level as a whole is pretty polished feeling for four days' work!
There are some quirks - like sliding feeling a bit weird with the spike section, or the boss fight(?) at the end of the first level feeling a bit rough, but it was generally a pretty fun game! I could see this, with some more work, doing well as an old-school dungeon crawling shooter.
I think the blood mechanic is interestingly integrated - having the armour act as a buffer that instead lets it regenerate, which is neat - but I wonder if it could have been done a bit more on-theme somehow? Or made clearer through the game that armour stops you losing blood over time?
Audio needs a pass over too, as it's quite rough at times (i got stuck on a wall, hit jump, and the audio source echoed into the void), but what's there is good enough that it doesn't detract from the rest of the experience.
Either way - really fun prototype! It's rough, but the vibes are there, and the art style is really solid and well-defined!