When you first launched Minetest, didn't you think it was just Minecraft? Actually not. Although their interface, style, and gameplay are almost the same, Minetest is essentially a free, open-source and cross-platform voxel game engine (written in C++ and Lua, using the Irrlicht Engine). It was created by Perttu Ahola and first released in 2010, and is now developed by a team of volunteers, with significant contributions from the community. It's available for Linux-based systems, FreeBSD, Windows, Mac, and Android platforms, and provides an API for users to create their own games and mods written in Lua.

Chasm is a pixel-style 2D action, adventure and role-playing game, developed by Bit Kid in 2013, and finally released in 2018. It combines the popular elements of Castlevania, Diablo, Metroid, The Legend of Zelda these classic video games. For example, it has the RPG game mode of Castlevania: Symphony of the Night, map design of Metroid, random item dropping system of Diablo, etc.

Mercenary Kings is a small and very cool indie game developed by Tribute Games from Canada, it lets many side-scrolling retro game hardcore enthusiasts feel gracious. Especially, after hatching by Kickstarter, it was successfully commercialized.

Rogue Legacy is a pixel & retro style and rogue-like (in fact that's Castlevania-like, I think) action adventure game. The entire game features graphics & systems restoring the ancient ways and cartoon characters.

Have to admit one thing, even in this time when games with high-definition graphics and fine & smooth textures can be seen everywhere, 8-bit console type of games with nostalgic style still has their unique charm.