Thanks!
I will have more puzzles and various interaction in the full game, it's something I will work on more when I'm done with the base of the game.
It is unity and generally it is custom solution for the soft body based on the few things to make it all work together.
The base simulated in the way JellyCar game does with some adjustments for my own case. Then you need to have extra force source to push objects and controller on top of it to with a lot of adjustments to make it work nicely.
I think at some point I will make a dev log how it was done, but I want to first finish the game.