I Made Playing Cards to Teach English (landenlove.xyz)

Hey, checked it out. I like the whole idea and how you've made different sections.

However, have you planned to integrate a quick playable demo directly onto the landing page?

I think this is a wonderful idea. I have spent some time in the past teaching TOEFL and found that children enjoyed games more than anything else. Gamification of learning seems to me to be the way forward.

Using a well-known game such as UNO is a great idea for the reasons you state - not as much time wasted on explaining complicated instructions and children can help each other if needed.