i'd say it's worth buying .. it's a not a particularly long or short game ... it'll take you a few hours to finish if you just sit there and play nonstop . but if you don't, you'll get a really good experience out of it.
I'm looking for an arcade game thats different with some replay value. It's either this or one of the two toy soldier games. I've heard that cold war doesn't have match making this time around so I will have to gather some friends first if I was to get that
I thought Shadow Complex had a lot of replay value. If you like challenges, there's some master challenges that will take you another few playthroughs to get. This was one of those few arcade games where I just kept playing after I got my 200g.
But that's my opinion. Like others said before, Metroidvania is a good style to compare it to as far as map layout and backtracking for items goes.