I managed to finish the game. I think the darkness concept has potential. With the ability to unlock more jumps to reach new areas, the game almost has a Metroidvania quality to it, so you could lean into that more.
At the beginning I was confused because I kept dying in a pit (I think) at the entrance of the dark cave, causing me to restart. Navigating in the dark isn't quite engaging yet so some adjustments are necessary. Like maybe you could have a system where you turn on a flashlight when you want, but it has limited battery, so you have to preserve the energy, giving the player agency and challenging them to strategize. That's just an example. Basically, I think the game needs some kind of mechanic to make exploring the darkness more interesting.
Like Overbern said, I feel like the music doesn't fit. Maybe something more atmospheric could be used to fit the vibe of exploring a dark cave?
As for new names, Google tells me that your current name is the French term meaning "depths" which is fitting given the theme of the game. "Profunda" is the Latin word meaning "deep." Maybe that could work for you? Especially since the "-unda" part sounds like "under" as in underground like your game takes place in. Profunda could be the name of the planet or something.
Overall, nice job! I hope my feedback is helpful to you.