Lines X is a very relaxing connect-the-dots game, with over 100+ levels to complete and idling achievements ... ok, the latter is frowned upon, but I'll let it pass due to my overall experience.
The BG colors can be adjusted, so you aren't being blinded by bright neon backgrounds. The music and audio can also be muted, and that's as far is it goes for settings. The game, being as simplistic and 2D flat coloured as it is, runs very smoothly regardless of how many programs I have running in the background. No bugs or glitches, and all it requires you to use is your mouse to draw the lines. Plus, when you re-open the game, it auto saves your last completed level, so you don't have to start over.
The levels progress in challenge, but there are some randomized difficulties. 20-30 levels after I'll get a super easy, 3 colour only level, before it resumes to the 4+ color levels.
Otherwise, Lines X is great for gamers who want a low-effort puzzle, that let's you multitask with other activities (Discord call, Streaming a TV show or movie, etc.)