Simple Dot seems like it has a nice idea, with you drawing lines to get balls from one end of a level to another. A simple idea but it looks like it does get quite complicated later on.
From what the developer has described, you will have up to five lines to draw on each level and the balls react differently to each of them. There's over 60 levels of this, various ways to solve each level and you can hide the ranking system if you just want a more casual experience.
Honestly, I love puzzlers like this. Simple ideas that let you give your brain a bit of a workout, while not being overly taxing so still good after a long day.
You can check it out and wishlist it on Steam. It's releasing on May 17th with Linux support.