The assets you've decided to use look wonderful together and had an overarching aesthetic. I really enjoyed the story and how you incorporated the theme. The main character slowly uncovering Tarot cards while the realization that something might have happened to their friend is starting to set in made for a good hand-in-hand combination of gameplay and narrative.
There's a "leap of faith" section shortly before the first portal, was that intentional? I find them to be a bit discouraging in action platformers and metroidvania style games, but it also kinda tied in well with the theme of the "Fool" Tarot card - if those two sections had been closer together in the level, my interpretation would have gone from "oh, huh, I didn't see that this is where I was supposed to go" to "that's genius omg".
The buildup to the realization and confrontation of the main character's loss also served well when it came to hyping up the boss fight. Although I ran into a few weird collision bugs that had me stuck in the middle of an animation and flying off the map.
Sadly, when I was finally facing the boss, I was unable to beat him. It was hard for me to tell if I was even weakening him, and now the bug I previously mentioned had gone from kinda entertaining to game breaking, because if it happened during the fight I had to start the entire game over from the beginning again, I couldn't just let the boss kill me and retry from the respawn point since I was still stuck.
Overall, while that final part was a bit of a letdown, everything leading up to it had me excited and I can't wait for a more polished version where I can finally beat that Death guy and see how the story ends, because so far I'm hooked! ❤