I've given it a go on my PC now and have some feedback. Generally, it looks really nice, I enjoy the modern look.
My only real feedback is that it seems too big. The best way I can think to describe it is as follows; it looks like it was made to be touch friendly (which is great!) but then on a monitor it looks too large and uses the full width.
Personally, I'd set a max-width on larger displays to something like 80% (to allow more negative space on the sides, keeping the content centered) and have the cards scale down as well. I'm not sure what you're using for the front-end so I can't be super specific with the correct names of styles etc.
I hope that makes sense. I don't want to take away from the work you've done, it really is well designed! If you need me to explain something better or provide examples (whatever you need), I'd be more than happy to help where possible.
Made some adjustments to prevent content from getting too spread out on wide screens! Let me know what you think (hard to test because my screen is not very wide). Before and after below