200MB of RAM should work fine. I still work on my games in Construct2 and sometimes use Construct3 to export games. 1/2 of my games have encounterd problems of this kind and while with one game it was clearly RAM issue with the others it was not ( that game was 450mb when exported from Construct2 and 700mb when exported from Construct 3 )
Anyway For games done or started in Construct2 and imported into Construct3:
Removing text objects solved the issue in most cases. Used sprite fonts instead.
Sometimes images larger than 2048 caused crashes
Unchecking preload sounds and preloading them when your loader layout shows helps with "staring at the long black screen" syndrome while things load.
Also the fade behavior did not work properly in the pre-loader layout ( works fine in other layouts ) and I had to do my own fade in/out using events.