is there a way to update from the previous version or import my save somehow?
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There's save files, you can try to copy them and putting them inside the folder of the new version, but you can run into bugs since those save files are going to come from an old version. I bet bugs will be very likely since they changed a lot of core systems and foundations for Act 3.
It's not hard to find. [Game folder]/[Platform]/The Forest of Love_Data. In there you'll find tfol.savegame and tfolBACKUP.savegame.
I personally would just start over to be safe, but I think trying it and seeing how will it break the game also sounds fun. Who knows maybe it'll work, or maybe it can work if you just change a few lines on the save file. I just advise you to not report bugs if you do this, since you are doing something that the devs did not intend and are not trying to make compatible.
I don't think you can do this on mobile.
The devs did implemented the chapter select and being able to jump into new chapters for this reason though. You can start in act 3 instead of starting in the beggining.