Finished "Journey To The Savage Planet" today (well, technically yesterday).
I really liked it. It's funny, it's quite interesting to explore, and while it's generally simple, at can certainly provide some challenge in fights. And sometimes in jumping, too. I was not bored to gather all the stuff in the main game. The DLC though... Not for me. It seems to *require* using flight mechanics in quite a few places, and this was irritating me quite a lot. Maybe because I play with gamepad, and it's not as convenient without a mouse.
But otherwise, good game. Sick soundtrack. Wish they release it as DLC at some point.