One of many 2020 IFcomp Twine games that is on rails, High Jinnks rises above due to being generally delightful.
For me, watching a jinni toy with humans is not generally my cup of tea; I prefer my games that take place in the real world to be ground in that reality without magic or mysticism. But gosh darn if it I didn't grin a dozen times while playing this one, probably because there's a heart and soul to these characters I wasn't expecting. The plot itself is forgettable, but the repartee between the jinni and your scrawny human friend is relentless. Sometimes the conversation feels a bit too cavalier and I don't truly buy the motivations of the humans in the story, but all in all it was a good time.
One thing Chamberlain excels at is using the hidden text feature in Twine to great effect. While I wasn't always enamored with the story choices, clicking on the hidden text was a regular treat.
Unfortunately, I did find one endless Twine loop near the end of the game that forced me to restart.