I don't know what gems are. The girls costs are ambiguous without any labels or icons about what currency they take.
You should prompt the player to check the girls by clicking on them. I had to experiment to know how to upgrade them and make the game less tedious because of the lack of fast forward or "close early" function, making me feel like I've wasted my time.
Edit: It seems that the speed controls don't react properly to mouse clicks. Might want to make a bigger button with a larger hitbox, an all-inclusive "speed" button that tells you how fast it's going.
Edit: This was explained in the beginning tutorial, but I think it shouldn't be so massed and instead an "as it's needed" optional tutorial. You might want to give "massed learning" or "do you want prompts as they become relevant?" option.
You are right, I know this game need a tutorial and due to lack of time I just inserted those screens that does not train the player.
I agree with you a step by step tutorial will help the player to understand the mechanics further because even when they are simple it could be hard to understand how you do this and that.
A tutorial instead instructions is needed!
Thank you for playing and for your suggestions