Grounded 2 playground should have the ability to create flat worlds where you can start from scratch and build your own anthills and add water to ditches you build. And frogs that you can spawn and ride. And woolly aphids. Yellow ladybugs. Wolf spiders with babies on their backs. And a lizard boss. 

There used to be a lizard boss in Grounded 1 and it would be a good idea. The could make somethin like a lizard claw blade. Instead of a frog mount, there should be a cricket one.

That actually sounds awesome. A flat-world sandbox where you can build everything yourself would fit Grounded 2 really well. And the new creatures you mentioned - frogs, ladybugs, a lizard boss - would make the game way more fun. I'd definitely try a mode like that.