Thanks for playing. I'm glad you enjoyed it!
The placement of the collectibles was meant to be more smart, but in the timeframe it just wasn't going to happen. Per "tile" it chooses a random lane (weighted so that the left and right lanes are more prominent) and places the collectibles in a line.
The side effect of having some collectibles impossible to get is frustrating, I get it. The upside from a gameplay perspective is that it encourages the player to take some risks to get them. Without the collectibles, the game is too easy! That being said, if we do more work on this post-jam, we plan to give way more attention to how collectibles works.