Summary: There's nothing particularly good or bad about Double D. It offers crazy 2D shooter carnage while bringing absolutely nothing new to the plate. It's great if you're looking for a throwback to the old days. But if you're looking for something new and fresh, you'd best look elsewhere.
Summary: I would give it around 65/100. Well, it is a little too obnoxious, but the humor is ok it gets to you after a while. The game is fun playing a decent side-scroller, and the ability to stack weapons into a massive fire-power-tool is pretty nice. However, it gets too hard too fast (i mean it's a 2D shooter you really need to balance such games in order for them to be enjoyable).
Summary: Contra clone with a "Serious Sam" skin. The gunstacker leads to really creative loadouts and I liked being able to keep presets of stacks on hotkeys. Tons of secrets and multiple paths through large levels make this one of the best contra clones I've played. However, lacking in multiplayer (what side scroller shooter doesn't have multiplayer?) is a huge letdown for me and leaves this game being just OK.
Summary: Easily the most fun I have had for $1.99 on Steam! This wonderful shoot'em up side-scroller is easily the best of the best Indie 2D shooter I have played on PC. It's pure fun and crazy. No story here just plain old craziness with guns. The Gunstacker is easily the most hillarious and innovative firearm madness invented since Contra's Spreadshot. Lots of crazy enemies in crazy quantities running around and just enjoying the explosions. Highly recommended!
Summary: Serious Sam Double D surprised me by being a low price indie platformer with the same sense of humor and very similar game design as the Serious Sam games. That means you should expect tons and tons of monsters, plenty of funny secrets, powerups, traps and straight-forward adrenaline-filled action!
Summary: You get what you spect, a crazy KILL EVERYTHING ON SIGHT multiple gun shooter in 2D. Remembers me the old school days playing Metal Slug and Contra, but with a modern fancy style. This game is indeed a very great way to enjoy time with screens like "KILL KILL KILL!
Summary: Serious Sam Double D is a bloody mess! Exactly how i like it :). This small game is full packed with guns, ridiculous enemies...and that's it. Simply Serious Sam in 2d side-scroller. Too bad there are no multiplayer option (classic coop for two players). Overall - it's a good cheap game not only for Serious Sam fans.
Summary: This game is quite simply Contra/Metal Slug on drugs. You can stack guns on top of each other for a maximum of 6, and combine that with the craziest enemies you've ever seen. You have Lava monsters jumping on Pogo Sticks, and stacks of Pancakes with Trumpets and forks for legs....and anything else you haven't imagined. It's quite simply...fun. Lots of enemies, killing all around, and just plain chaotic at most times. Games have always been about one thing: Being fun.