Playing Bomb squad academy, a puzzle game. Quite short, I'm one hour in and I think it wouldn't take more than one hour to clear the remaining puzzles. It's based around electrical circuits (quite simplified, if my memories of high school physic serves me right), with the goal of each puzzle being to defuse a bomb, by routing electrical currents to the defusing part of it.
There are a few elements (AND,OR,XOR gates, switches, timers, capacitors, cables to cut) to which to use. Each element is brought in a series of levels of increasing difficulties. Each bomb is on a timer, but the penalty is nill, since you can start again that puzzle immediately. It's kinda easy, but I think the devs went that way on the difficulty so that the puzzles are doable in the time limit (between 30s & 2 mins). Also it's weird how a few time I successfully defused a bomb, but had to go back and do it again to understand how it worked.
I got it in the latest sale, I'd say it's a tad expensive at 4.99 for less than 2 hours.
I'm also still playing Tomb Raider: the last revelation, I suck so much (which is understandable since it's the first time I'm playing a platformer like this), but it's still fun.