Keyontae Johnson is back playing college basketball for the very first time since collapsing on the court almost two years ago ... and the guy got back to doing his thing -- dropping 13 points!!
Johnson -- who transferred to Kansas State this August -- was in the starting lineup for the Wildcats on Monday against the Texas-Rio Grande Valley Vaqueros ... helping the Wildcats secure a victory.
After the 93-59 win, Johnson talked about how emotional the moment was for him.
"I'm feeling good," Johnson said.