The 121-161 victory leaves the Rockets just a game behind their opponents in their first-round playoff series after the rookie shooting guard gave them the lead inside the final 30 seconds of overtime.
The coach told reporters: "He competes. He dives on the floor for balls. He's a tough kid.
"We haven't done anything yet. We've won one game. But it feels a lot better than losing."
Daniels spent time in the NBA's development league earlier this season before making his debut with the Rockets last month.