I quite like the concept of switching between worlds and having different abilities in each, especially with the twist of needing to collect a resource to get into the realm you ultimately want to be in.
However, I found that the way the system was implemented was a little confusing- in hindsight I can see that the goal is to get into the heavens and reach the end there, but that wasn’t immediately obvious when I started playing, so I spent a while just kind of wandering around aimlessly. The underworld also seems like a punishment for dying with low karma, so I’m still not really sure where the underworld portals fit in- it seems like the only reason to take them is if you don’t know better.
To sum up, the main issues seem to be with conveying information to the player- but those should be relatively easy to fix, either in this game or a future project.
Speaking of fixes, I noticed that you mentioned changing the player physics in the update- while the new physics feel a little stiff, they’re not frustrating to work with or hard to understand, which is extremely important for a platformer.
I also like the music a fair bit. It’s relatively simple, but fitting. I especially like how creepy the underworld theme is.
Overall, I’d say you’ve got a good concept, so if you add more information for the player in-game in the future, you’ve got solid potential on your hands.