I didn't get bored, because one run doesn't take too long and I could finish it quickly. I am a person who wants to try everything, so all levels of difficulty and challenges. I played through the game 3 times in a row, but took a break on each run. From 1 to 2 weeks to increase my curiosity. That's why I did not get bored so quickly.
This game is not as complicated as a chess game, no one said it was. If you want to get to the good end, you have to at least use your head a little bit to get there. If you just start running without knowing how the enemies work or how the level system works, or get tips from the tutorial guards, you won't make it.
With H-scenes I would agree with you that in the same level you see too often the same H-scene just a bit different and Karren herself also has only one H-animation per category when she herself becomes active. Each level (5) also has a Game over H-scene which means when Karren loses in battle, she is brought to a certain room for example in the first level in Bar and the second level in WC Kabinen to have fun with her. There are also side activities where Karryn can work as a bartender, receptionist, stripper and as a toilet woman where she gets benefits. where there are also special H-scenes for every part-time job. where there are also special H-scenes for every part-time job. Yes, I also think it's a pity that “Karryn Prison” is structured in such a linear way and there is only one way and there are no side quests, for example the rooms branch off. Where you meet other opponents or something similar. You could have gotten more out there.
I don't find $30 a little and I think the price is too high. Personally, I compare "Karryn's Prsion" with other H-Games that have a similar structure. For me personally it makes no sense to compare an H-Game to a non-H-Game. That would be like comparing a racing game to a shooter or comparing "GTA 5" to "Call of Duty" because both have shooter elements. I would compare "Karryn Prison" to "Colette the Cum Collecting Alchemist" or "Treasure Hunter Claire ~Cum Collecting Adventurer~" as an example.
die or give up. I don't find any good content either. Personally, it bothers me when a game is structured like this. As a player, I want to win every fight and not lose on purpose to get an H-scene.
I wish you a nice day.