Thank you for playing!
I made sure one of the hardest jumps in the game is right at the beginning, just to be sure to start the frustration as soon as possible, thats the jump you are referring to (third boat).
It totally has an ambience music (an underwater noise) but the volume is quite low so it is easy missed, I should definitely turn it up a bit!
Viewing post in Diving Under It with Oma Gerio jam comments
Aah, I was playing without my headphones, so maybe that's on me. Although if I missed the ambience sound, it's probably too low, because the voice-over was in a pretty comfortable volume.
The hardest jump being at the beginning it's totally fine (I imagined this was a difficult spike by design), it definitely made me more invested in getting over it (ha) to see what the rest of the game is like. Again, amazing game (and voice over!). If I ever get after the first part, I'll share a screenshot at the game page hahaha.