v0.5.4.2
Hailey's Treasure Adventure is a step above most hentai games, in that the game it's attached to is pretty good.
Controls:
Uses WASD, space, F, G, V, C, X, Q, E, M, Ctrl, 1, 2, 3. It's interesting that it was designed for one-handed gaming, but there are so many controls that it's not really feasible to use. Some of the controls are redundant imo, up/down are only used while climbing ropes, not having the option to use Up to jump or Down to crouch can sometimes get annoying.
The pickaxe attack has a bit of delay, and jump + pickaxe will cancel if you land on the ground before the animation finishes. One thing to watch out for is that you can't change the direction you're facing while climbing a rope, which means you can't attack monsters facing the other side unless you get off and back onto the rope. If you take damage while on a rope you will also fall, which is frustrating but manageable for everything but that bastard camping red skeleton on level 10.
Gameplay:
I was intitally going to compare the game to that old 2004 flash game Motherload, but it's not exactly a good comparison because even though you spelunk for treasure, you never dig new underground tunnels in HTA. The levels are not all generic underground mines, there are also pyramids and ice caves. Some of the maps are really big, so M for minimap and Q to zoom out helps. In addition to getting money from mining ore, you also get gems from killing monsters which unlocks outfits. Strangely, you can only buy Hailey outfits from the main menu, instead of from the in-level shop NPC (which means you also can't change Hailey's outfit in-game). The cash and gem upgrades are pretty expensive, which means the game will get fairly grindy. There's also a set of chores/achievements that don't seem to affect anything.
I'm not sure if this is a bug or a feature: I only needed to buy food once, and then it never ran out and I could constantly heal to full. Losing all of your HP causes the level to reset, so there's plenty reason to spam burgers. I think the game as it currently is will be really frustrating if this were to get patched.
There is a story, but the story doesn't matter. The major downside here is that there's no fast dialog key, trying to speed up the dialog will skip the entire frame, which is bad because each level starts with dialog that you only see once.
Hentai:
There's H content in the form of in-level knockdown animations, and stills.
Most of the hentai is giant insect-related. There are worms, spiders, bees, scorpions, skeletons, zombies, plants, goblins, a bat, a witch, and a snowman. The achievements and older versions of the game suggest there are several other monsters that aren't done yet. The insects have a (toggleable) feature where they can make you lay an egg. This makes you lose HP and can interrupt what you're doing, but doesn't have any long-term consequences.
The gallery for both types are unlocked via getting raped by specific enemy/enemy combos, which can sometimes be hard to figure out. If the achievements didn't spoil it, I wouldn't have ever figured out that you can lay monster eggs to harrass the little sister.
The gallery mode omits the 'Hailey lying on the ground afterwards' sprites, which is disappointing. I'm pretty sure all of them are different, which is actually kind of impressive.
There's a decent game involved, and there's a surprising amount of thought put into the details. There are some places that are clunky, but overall I think this is worth a play.