The game jam took place between April 10th and April 20th, giving everybody about a week and a half to work on their submissions. Pretty much the only strict requirements were that every submission have a Linux build and that all assets be properly licensed. At the closing date there were a total of 33 entries of many different genres.
I haven't had the opportunity to try every game but a couple that I liked were
Deadline Delirium and
Water Closet. Deadline Delirium pays homage to classic point-and-click adventures games. It has a great art style with a bit of that classic adventure game humour. Water Closet is puzzle-platformer that's more platformer than puzzle and has pretty unusual setting. I especially like the clone mechanic where you play a section of a level to record your actions, then work together with your clone to complete it.
Head on over to the official
itch.io Linux Game Jam 2019 results page to view all submissions and comment below which you found interesting.