Thanks, Anonymyst! You spot some aspects that worried us, so we really appreciated your comment!
Regarding the white backgrounds, we're aware of the annoying bug :( Even if it happens only few times - right after the river splitting, because one path interferes with the other - we weren't able to fix it within the jam's period, therefore some runs may randomly be blocked. That's not good, but we hope to upload the fixed version after the voting session!
The water texture is a sort of tileable background that follows the player, but instead of moving pixel by pixel like the player does, it "jumps" in steps equal to its tile-size. On top of that, the texture itself is composed by five layers independently animated. This way, we were able to reach the continuous drawing effect with controllable animations :)
And finally, as you already said, it misses a scoring system, which we didn't put because the obvious solution (a number score) was against the Textless wildcard. We thought about a progress bar, but having an endless run it should have been... endless itself ^^' Maybe something like you suggested could fit, the zooming-out track is a neat idea!
Hoping that this answer doesn't seem like a long excuse, but more like a brainstorming / ideas-exchange. It was just because we really appreciated your feedback, so thanks for taking the time to write us! :)