I think adding bonus scenes that are never unlocked and only in gallery is wrong for any game in general, as if i wanted just the scenes, i could cheat and check the gifs/images in the files folders, could be better implemented as a 'choice' that you can't click because you don't have the tier, so that it is still in-game content, even if paid.
The game is still grindy, but i hope it is because it doesn't have enough content. Maybe when the devs will add more scenes, the game gets less grindy. Currently also the value of lvl2, lvl3 grade gift items is the same as lvl1, just the color matters when you are gifting it, which shouldn't be the case.
The unlockable scenes are also the only scenes that are slightly sexual (handjobs), here i don't know what the devs are thinking as the main purpose of the game is to be a porn game, and if you are gonna hide handjobs behind better tiers of subs, is it still a porn game or just a teasing game?