The patch is rather big, the central feature is being able to custom-build your own level to play in. But beyond that there’s massive rebalancing to dandelions, healing items, 3-hit combos, 2H weapons, enemy wave retaliation attacks, MIX.Rs, everything.
Also, Grounded is free to try out for the next 2 days (as of me writing this): https://store.steampowered.com/app/962130/Grounded/
I’m not a huge survival game guy but I found this one really fun. I loved Honey I Shrunk the Kids as a child so that probably has something to do with it. Might have to pick it up again to see the updates.