I started out playing Pixeljunk Eden on the PS3, its original platform(I think). I loved it! It is a colorful game, and the techno soundtrack puts you at a decent pace which relaxes and calms you(or maybe techno gives you a headache?). It doesn't really have a story-you're a small creature growing colorful silhouettes of plants by collecting flora-looking objects called... wait, let's not spoil it. But in short this game, even though boiling it down to its structure makes it seem tedious and repetitive, keeps you engaged and interested, even when calmed while playing it. It's unique too! I especially liked how the levels changed colors and became decently harder as you played through them. And despite it being timed, you can replenish the timer so you have plenty of time to do other things while playing. The negatives of the game pretty much fix themselves.
I have only one problem with this game, and it's just on this port-there aren't many video settings, which means if the game runs slow for you you're pretty much doomed. And it runs slow for me. It's an absolute killer. But as long as you have a powerful enough machine, this won't be a problem at all, and you can enjoy it as much as you want. Another con is that it used to be a co-op game where you could play online with strangers or your friend could pick up the other controller and join, but if you never cared for multiplayer, that's not a problem either. I'm also noting here for people who started out playing the PS3 version that the PC controls are a bit awkward to adjust to, but it's definitely not impossible.
In short? The game has vibrant, well-animated artwork, its physics are sensical and easily adjusted to, the goal is simple and you can start it up whenever without worrying about where you were in the gameplay. I recommend this!