140 is a very short (~45 minutes or so, maybe less) platformer with ultra-minimal geometric graphics, a little reminiscent of Thomas Was Alone with even more of a commitment to visual minimalism and trashy, angry-psychadelic graphics. What sets it apart is that the platforming is built around rhythm elements, much like something like Beatbuddy or Sony/PSN's "Sound Shapes". Basically, as you go through the levels there are timed obstacles, platforms, and other mechanics that play along with the dirty, dub-step / glitch electronica that comprises the music. Periodically you will collect an orb which you bring to a set point, which causes the colour palette, sound, and mechanics to shift. At the end of each of the three levels is a boss which functions kind of like a shoot-em-up-ish genre. If you die, the screen dissolves into analog TV fuzz as the music glitches out even further and you respawn at the nearest checkpoint.
Cheat code: If you want to make the game easier, go slowly and count out a beat. Mostly the rhythm patterns seem to be 4/4 or 8/8 so if you can count the beat in your head you'll be able to crack the code no problem.
Whether you feel like you'll get $5 out of such a short game is up to you, but I found it to be a great experience. Often times when I died, I chuckled in spite of myself because I found the rhythm mechanics very clever. I especially liked the bosses.
Because of the emphasis on music, I recommend headphones--certainly you would find it very difficult to play without audio.
Hopefully this review has given you the information you need to try to decide whether or not this is for you.