Love your beginning 2 lines, great start
In a world where refrigerator is a symbol of wealth, all those kids wanted from me were pens, which I had brought plenty.
"...where the refrigerator..." "...pens. I had brought plenty." Just for clarity
I was leaning at the window. The kids were experimenting with self-introduction using the words we taught them during the day; I was struggling to count from one to ten in Lao
"As I leaned against the window, the kids experimented with..." "I struggled to count..."
two-square-meter
"two square-meter" i think
Also, some of the ":"s used should be "."s instead. For example, "...Santa Claus. The kids..." or "Santa Claus; the kids..."
Santa Claus: the kids
Sounds awesome for the most part!