It's possible that someone manually flagged your first two videos, and the subsequent videos were detected by Youtube automatically.
The subsequent videos had different gameplay and edited out cutscenes so it's impossible for youtube to detect the videos that are almost completely different.
I doubt the videos were flagged manually since they had 0 views and got rejected instantly, and even if they did get flagged, the videos did not violate ANY YouTube rules, it's a simple gameplay video from a game that has been released, I spoke to the game publishers and even they were confused on why this is happening.