Hailey's Treasure Adventure is a delightful gem of a hentai game. The gameplay overall is smooth, and the graphics are beautiful. The sex scenes are great, the platforming controls are also great. The sole problem I have with the game is the "Sugar Boss". I fled the first time I encountered her and returned after I had beaten the last level. After beating the boss I realized I had effectively locked myself out of viewing her animation/CG now, because whenever I return to her lair she's passive. 

Aside from being able to accidently lock yourself out of this one scene/animation, I haven't had any other issues with the game, 9/10!