score:3
As @GayotFow indicated in their response, everything was fine and I was granted entry without problem.
The ECO asked:
The ECO noted my previous stay and stamped my passport right next to the stamp from earlier in the month. Strangely with a stamp indicating Dec 2018 entry. The whole process took about 2 minutes.
Per Gayot Fow's recommendation, I did bring a copy of my work contract in my current country, to show that I have major reason to return as stated. It was never necessary but good to have anyway.