Yeah it looks like a long jing style tea. Since you got it by way of your friend and you still got it in late March, maybe it's a high mountain Sichuan or Yunnan longjing style tea. Since your ID is chengducha, maybe it's a Sichuan high mountain tea?
From the stem butt, it looks like a nice spring first harvest. But the leaf shape and leaf surface look like the processing could be improved and maybe it's full-machine processing - just a fast impression and not necessary accurate impression from the photo.
What's unami flavor? Is it somewhat seaweed flavor? If it happens to long jing style tea, that may mean the processing didn't follow the traditional long jing processing. But it's not necessarily a bad thing since you seem to like it anyway.