I won the game here on SG (Whitelist giveaway), so I made a few lines review after finishing it. Here is a copy-paste reply to that giveaway after finishing the game:
"I finished it not long time ago; to be honest, I was skeptical about it because of mixed reviews (and because I liked alot first 2 Mafia), but I really liked it, even more than Mafia 2. The only con was maybe the graphics, but the atmosphere was perfect (background, soundtrack, cars AI behaviour - I was amazed how the AI white people started to stare at me and question me, and police was trying to see why I'm out after 10 PM ingame).
Thanks again!"
If you don't go for all achievements, I think you won't get bored, just a Mafia story that keeps you busy for few hours.

while Visual Novels are not nearly as represented as they should be

I never mentioned Visual Novels. The problem with Visual Novels is typically in publishers restricting them to internal platforms (eg, JAST's own website/downloading service), so that's a whole nother topic. There's plenty on Steam despite that, however. Even if we ignore the more dubious offerings, there's still enough notable. big-name VNs on Steam now to make it one of the top represented genres, even if certain genre labels- like RPG- do still overshadow it. Further, if we then step back and include rubbish and porn offerings, it may actually be the best represented genre of all.

I still believe Dungeon Crawlers are largely underrepresented considering there are quite a few option to put together say a $15 bundle with 7 good to great dungeon crawlers. It doesn't take that much to release a bundle.

I addressed that topic already in exhaustive detail.

To recap, unless you want a bundle filled with less broadly appealing games and rebundles of heavily rebundled games, there's not much in the way of options at the moment for a bundle themed entirely around corridor-style dungeon crawlers. You're basically just talking about rebundling Grimrock, Grimrock 2, Bard's Tale IV, and The Keep, and then adding in low-review filler games.

That, or you're looking at pushing some very new games (of which there are still only very few in total), which developers likely aren't willing to bundle yet, and of which only two are even broadly notable, into a bundle, and basing the entire bundle around them. Which, sure, can happen eventually- but that's not something Humble has control over. If that's something you want, you should push on the individual developers involved with the games you're interested in seeing bundled.

And within the context of Humble they're absolutely not underrepresented, they're actually substantially overrepresented. Representation is based on statistical inclusion, and Humble's offered more of available Dungeon Crawlers than they likely have of any other genre. Obviously, that a result of there being so few available on Steam to begin with, which makes it a lot easier to "catch them all" but, again, that's absolutely not something Humble has control over.

The Legend of Grimrock argument I would disagree with since both those games were bundled 5+ years ago. A very long time.

Completely irrelevant to the topic and a complete strawman argument relative to the topic of "Humble seems to terminally afraid of VNs for some reason."+"And First Person Dungeon Crawlers, don't forget those." = "Humble [avoids bundling] Dungeon Crawlers".

You can definitely tangent a new topic on "I wish these would be rebundled", but in the context of the current topic, that sentiment'd actively be supporting the idea that Humble is doing a good job of having put Dungeon Crawlers into their bundles, if they're needing to rebundle them just to keep the genre being in bundles at all.

but Hubble Bundle doesn't appear to have issues with bundling very recent games

No, but developers and publishers do. Where're you putting your mind towards with that?

Feels like you're still going off on a different topic, there; Humble's repeatedly noted that they have no control over bundle inclusions themselves, though we can probably assume that that's not true for their self-published titles. Beyond those, however, the only time we really see newer games included in bundles is when it's from a publisher known for doing such, or when a game is doing poorly on sales. Highly visible indie games are honestly often the rarest inclusions into bundles, so there's no reason as of yet to expect Vaporum and Starcrawlers to be hitting bundles within the next couple of years, nevermind so quickly after release.

[most of the rest of your post]

You're creating an entire topic based on Visual Novels all on your own, there.

But when you compare to Dungeon Crawlers in the first person, there are quite a lot less.

My entire first post was noting that there's extremely few corridor-style Dungeon Crawlers available at present, yes.