Newbie in need of guidance please

Hi Jules, welcome to Storyline 360. Please take this as constructive feedback.

General:

I would use the modern player and set the menu to closed by default, the menu I would set to collapsed there yes a lot of content which could be overwhelming.

Add in the player volume control as for accessibility it will be needed. 

Unless you plan on adding in resources, switch off the resources tab

Check your menu, the are cases of sentence case and all initial caps.

I don't get the tabs on the main page and the animations in there I would remove as they don't add anything. Think these should be on a separate slide.

For slides where the audio is the only content why not set to automatically advance?

I think you could use the clients colour scheme in the buttons, looks like default storyline color scheme.

The Jess is not happy section I found a bit confusing as it animated too fast.

I don't think the T/F game fits with the style of the rest of it, I much prefer the T/F game style. Although hover states are really odd in the game, and the Circle has changed to an oval. That is about as far as I got. 

I am not keen on the style but if the client is happy, I think the text alignment at the top looks unbalanced, and not sure you should give as much real estate at the bottom to the logo.

Good luck!