^Maybe it's like this:
What we're seeing is actually a cliff with two stalactites on the left side. There's a floating platform on the right side. The dots represent interaction points with our character, probably something similar to a grappling hook mechanic of some sort?
Whatever, doesn't look like much yet, but I'm curious anyway.
Hmmm... I just notice that the red lines had always a line.
Also, I remember them asking on Twitter about what games are like Contra. It gives me the impression that the next game will be like SMB but with that genre.