I disagree with the other commenters. The game is a blast with friends and smooth in gameplay. The controls are easy and predictable, and everyone I've played with has picked it up very easily, even those who aren't heavy gamers. The ground you can stand on looks different than the walls you can't stand on. If you are in a poison cloud its because you stepped on the brightly colored purple poison plants. It can be challenging, but that's the whole point. Everyone has different tastes so it might not be for you, but it's not very expensive to try.
I'd love to see the game advance with some more variation to the biomes or items or similar so that it can feel more fresh on every playthrough.