Pure & Simple theme google

Hi all
I’m preparing a dog wordpress site, using the above mentioned site from Styled Themes (actually, just the lite, free, version).
I appreciate it, and I have in mind to move to the premium version.
The reason I’m asking your point of view guys is I’m receiving alert messages from GOOGLE saying the site is not optimized for mobile devices.
This due to the fact main image seems to be bigger than screen capabilities and there are some selectable items too much nearby to be usable (always just on mobile devices).
On the other way round, on apple, samsung and huawei devices I used for testing, everything seems to be ok.
Correct displaying and … still able to select items !
Where I’m getting wrong ?
Thanks in advance for any suggestions.
Regards,
Luca

The page I need help with: [log in to see the link]