Oh wow, yeah the way it looks in that capture card recording is way darker than intended. You're supposed to be able to just barely (but still reasonably) make out the silhouette of the level against the BG, but it looks like the BG shows up as basically just full black.
I'll figure something out to address that. Maybe a config menu setting that boosts the brightness of that BG specifically... maybe an outline around the level... will have to think about it.