is the game abandoned? i mean no update in the last 9 months
Their current plans are developing a final version with some extra content and a bunch of bugfixes. They are showing new art assets on the patreon so it should still be under development even if they haven't released anything yet. It seems like they're prioritizing releasing their upcoming game Arenius first though which has been delayed quite a long while from their original release date, so it might be a while before Roundscape is updated again.
As someone said above me the main story is completed, so future content stuff seems to more be side stories and new companions. (Or seems to be completed? Haven't finished the game yet even with a main save that has gone past the 30 hour mark, but the main story arch seems to be approaching its end.)
Note that they've said
the final release will break old saves, so take that into consideration if you wanna commit to the current version.