Pretty fun little entry! The upgrades were clever and played off the clarity mechanic decently well. As far as said clarity mechanic itself, I found the revealing platforms bit to be pretty meh, but what I actually enjoyed the most about it was the slowdown effect when activating it. It was really helpful for gaining some extra precision in platforming and sold the idea of heavy focus a lot more. I think expanding on that could make for a really interesting mechanic.
As far as issues I had, the checkpoint sound was kind of grating especially when it would play repeatedly when moving through the room. I think maybe disabling the sound for already active checkpoints or just placing them in places you're less likely to repeatedly pass through would help with that. The lack of animation for enemies getting hurt or dying also made it kind of hard to tell when I was actually hitting them, especially when there were multiple enemies present and the sound cues got muddled together.
I also had a bug with the boss where the game didn't stop when the dialogue started, but it did take my control away - the boss just kept walking and attacking while the dialogue played, until he ended up pushing me out of the room.
Overall though this was a decently solid entry, and def had some pretty interesting mechanics to explore!