Yeah you have good points. The idea was to not have a need to use the anchor when collecting the vinyls, just grapple fast back and forth, but you're also correct that the grappling would probably work better if there was air movement. I appreciate you for going to the itch page to look for hints, the game isn't very clear with its objectives. We kinda ran out of time with making more in game guidance... Thanks for the praise and the detailed comment!
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Yeah there wasn't much hope trying to anchor for most of the vinyls. I got lucky and managed to anchor one of them, but for the mostpart I tried to go back to the balloon like you said. But I quite often got stuck underneath vinyl islands for a while trying to get up lol, by which point the balloon is long gone.