Thanks for your feedback. At some point I had planned an infinite procedurally generated level but I ran out of time and I just authored it by hand with an impossible “wall” at the end. The level is doable with a couple tricky parts towards the end where you just have to quickly flip down and up again, change side and do it again. Initially there were “weeds” underwater instead of “rocks” but they were even harder to see.
If any 3D artist sees this comment and want to collaborate on enhancing the obstacles shoot me a message!