Echoes+ is described as 'intense retro action space shooter created with App Game Kit 2. It will test your reactions and concentration levels to the max!'. There are nine games similar to Echoes+ for a variety of platforms, including Windows, Linux, Mac, Steam and Android. The best alternative is OpenTyrian, which is both free and Open Source. Other Echoes+ like games are Glucial Fighters (Free), Chromium B.S.U. (Free), Counter-Strike 2D (Free) and Kartoffelpüree (Paid).
Chromium B.S.U. is a fast paced, arcade-style, top-scrolling space shooter on Windows, iPhone, PSP, Mac, AmigaOS 4, Linux and numerous other UNIX-like operating systems. It is a free software distributed under the Artistic License.
Top-Down Multiplayer Shooter More than just Counter-Srike in 2D! Accomplish new missions like capture the flag or domination! Use a huge arsenal of weapons and equipment including crazy stuff like portal guns, lasers, RPGs, turrets and much more!.
Nex Machina is an intense twin-stick shooter featuring vibrant, voxel-based visuals with spectacular particle effects and over-the-top, bullet hell gameplay in the vein of classic shooters like Robotron and Smash TV.
Hyperlight is an action-packed, over-the-top shooter where you combat hordes of alien monsters in a virtual cosmic environment. FEATURES - Gamepads support (recommended) or Touch controls. - Stunning HD graphics, rich in special effects, enemies and explosions!