Great Game
I enjoy a good tank game and this is one of my favorites.
theweaver2 - I saw a screenshot of pocket tanks and it didn't look like the exact same game at all. It looked like tanks on hilly terrain shooting at each other, but then, so do half a dozen other tank games.
I never thought of Shellshock as being a ripoff at all but rather as progression in the natural order of things as far as tank games go.
And I'm glad that you mentioned the digger. I recognized that name too, but not from pocket tanks which I've never played. I remember it from Scorched Earth in the early 90's. I'm pretty sure that predates PT.
If you do a little research I think you'll find that there are many games that are very similar to this game. The differences are often quite minor. The author isn't ripping anyone off. He's just doing what many others have done before; He's taken the same basic idea and put his own spin on it. The game industry is full of this (actually, so is film, music, literature....). Even if we only examine flash games it is pretty nuts. How many launching (think toss the turtle, or my favorite, burrito bison) have you played? How many tower defense games are out there? I could go on and on.
This is what games do. This is how it works.There aren't a whole lot of "original" ideas out there. Most are just adaptations of one or more existing games. The tank game genre itself just so happens to pretty much stick to tanks, so the games almost all look very similar. A notable exception are the Worms games which of course uses worms, yet the basic idea remains.
As was previously mentioned, this game is free and PT is not. So even if it was an exact clone, it still serves a purpose
If you'd like to have a look at other software that has similarly "ripped off" established software, check out Linux.