Just went back and the level up works fine, it's just that I didn't go back to the cave after working at the brothel to see the new scenes, so the amount of work for level up is also okay for what is in the game right now. I still think it's too much tough, the amount of strength needed for the centaur scene is 15, so that's 2k lust points at this pace. I think 100 per point would be better, it's still enough to make leveling a non-trivial task, but only require 3-4 actions per level.
As for the rest, I agree and add:
-the button flash can stay as long as it's once, a visual indicator is welcome for people who play on mute. Also, try to make the sound effect for clicking very subtle, we just need to hear something is happening
-add some basic VN keybindings: enter to move forward, ctrl/shift to skip, H to hide UI.
-make it possible to skip certain scenes, tbh, I don't know exactly how the game yet, but the more kinky content you put in the more likely it is to turn off someone who otherwise enjoys the game, so a switch, option to skip and not making stuff dependent on the player doing this or that scene is appreciated. If not that's fine, just mean I'll have to be extra careful to not get the mc preggo.
-add a quest journal and better directions.
-add some visual indicator for places in the map, like a white outline in the places you can go.