Read the developer’s release notes
The lake is something you tend now, not only something you swim through.
Four hands-on ways to help a reach of the basin: cool the water, slow the flow off the farms, put shade back on the bank, and open a side channel. What you do to a reach changes what the c'waam meet when they swim it afterward, so the tending and the swimming are the same story.
A journal that keeps what each cohort did, so you can look back at the basin you built rather than starting over blind.
A For Grown-Ups page.
The water is drawn the same way on the title screen and in the swim now, so the basin reads as one place instead of two.
Still one price, paid once. No ads, no in-app purchases, no tracking.
Source: Apple App Store listing.