Hey, thanks a lot for the feedback, I really appreciate it!
No, as cited in the original Itch.io game page, the only plugins I used are: Discord RPC SDK and ParticleText. I made the leaderboard from scratch myself, as well as all the other assets. (except for the music obviously). I made the meshes, particles, shaders, VFX, code and everything.
As for the readability, I feel like because of the double jump mechanic, combined with the sprint mechanic you get a sense of how much you can move in 3d space when combining those 2 mechanics. The effect of that is the "readability". Depending on how much you sprint you'll be able to understand "okay, I can do this jump, but not that jump". That was at least what I was going for and IMO (as well as from feedback) I think I kind of got it. The 2 levels have different layouts which you can memorize, helping you be able to say "ok i wanna go there so I don't fall this time around".
The game IS designed with frustration in mind - no checkpoints, no respawning on platforms, etc. Judging from feedback from other people it seems this has been achieved, but it's always good to hear more opinions!