Games like Monogon: Echoes

Brickadia is a next-generation sandbox simulation game featuring amazing visuals and plenty of humor. Play solo or join friends in co-op, multiplayer, or PvP modes to build massive worlds, intricate physics contraptions, and dynamic creations using intuitive tools and real-time scripting. Unleash your creativity with interactive builds, logic circuits, and customizable avatars.

"CodeSpells" is a simulation game that offers a variety of play modes, including single-player, local multi-player for up to 2 players, and player-versus-player. The game's development and community are still active, with a new focus on building an open-source platform for the creation of various games and experiences. There was a delay in updates between September 2017 and August 2020 due to the team seeking additional funding and taking care of personal needs.

GameGuru Classic is a user-friendly game creation tool, designed to make game-making accessible for everyone. It offers a range of features such as a character creator, model importer, building maker, and a complete scripting language, along with over 6GB of free game assets. The focus is on providing a fun, intuitive experience, allowing users to create their own games quickly and easily, with no technical expertise required.

"Mod & Play" is a physics-based sandbox game that allows players to manipulate objects and create their own constructions, either alone or with friends. The game features full Steam Workshop support and a customizable editor, enabling players to modify the game and share their creations. Players can also create and configure their own server with mods for a unique gameplay experience.

Onset is a massively multiplayer role-playing game that lets players create and customize their own experiences using over 400 Lua functions. These functions allow for the creation of game modes, spawning of various objects, and even customization of the user interface. With support for singleplayer and multiplayer modes, as well as the ability to host your own server, Onset offers a highly flexible and customizable sandbox experience.

"Medieval Engineers" is a sandbox game set in the medieval era, focused on realistic engineering principles. Players can build various structures, such as castles and siege machines, using a variety of materials. The game also features a physics-based destruction system, allowing for realistic deconstruction and demolition of creations.

Planet Explorers is an open-world sandbox adventure game set on a distant planet. Players can build and customize their own tools, vehicles, and structures, while also gathering resources, completing missions, and fighting alien creatures. The game features a dynamic story generation system, allowing for a unique experience with each playthrough.

Blockland is a open-world, non-linear sandbox game featuring single-player and multiplayer modes, where players can build and create structures using toy-block-style bricks, with plenty of humor but also known for its bugs. Players control a tiny minifigure and have the freedom to design and construct without set goals, either online or through a local area network. The game encourages creativity and exploration in a virtual world.

Planetoid Pioneers is an action-adventure game that allows players to explore, build, and fight on procedurally generated planets. With a physics-based sandbox editor, players can create their own vehicles, structures, and weapons using various parts and modules. The game also features a campaign mode with puzzles, challenges, and a story line to follow.

MyWorld - Action RPG Maker is a sandbox-style RPG game that allows players to create and share their own adventures. With an intuitive interface and a variety of tools, you can design your own characters, monsters, quests, and environments. The game also includes a lengthy campaign mode, offering a fun and engaging RPG experience even for those who just want to play and not create.