Hard to tell by looking at a pic on my phone, but I don’t see anything alarming on the cam.
Pull each lifter and carefully inspect the bottom of it.

When cam lobes go bad, the lifters almost always go with them.
With as little run time as it has, the lifters should be perfect.
If you see something iffy on one, carefully inspect the corresponding cam lobe.

Did you check for lifter rotation during assembly?
What are the open and closed spring loads?
What did you use for cam lube?