Games like Red Hot Robot Ultrarena

"Iron Rebellion is a mech combat game with fully interactive cockpits and physics-based interaction. Engage in cross-platform online combat with customizable mech classes and loadouts. Experience advanced movement and six official large-scale environments, with many more from the community."

Telefrag VR is a fast-paced, arena-style shooter that pits players against each other in intense virtual reality combat. Utilize a variety of unique weapons and special abilities to blast your opponents, and teleport through their minds to secure a swift and satisfying kill. With multiple game modes and arenas to choose from, Telefrag VR offers a thrilling and immersive experience for fans of competitive multiplayer mayhem.

"Skara: The Blade Remains" is a free-to-play, team-based melee combat game with fast-paced action and a focus on timing and accuracy. Each character has their own unique combat style and skills, and team synergies are crucial to mastering the game. Quick multiplayer matches are available in two modes: 1v1 Duel and a second unspecified mode, with matches ranging from 3 to 10 minutes. Fight in frenetic skirmishes and become a legendary Skara hero.

"Grimoire: Manastorm" is a free-to-play, team-based first-person shooter set in a fantasy world. Players choose from a variety of mage classes, each with unique abilities, and compete in objective-based modes or battle it out in arena-style matches. The game features fast-paced action, strategic spell casting, and destructible environments.

"DRONE The Game" is a free demo version on Steam, modeling itself after classic shooter games with drone combat. The full version is planned to be free in the near future, offering updates and modifications from Earth 2. Currently, players may experience issues with purchasing the game, but support is available on the official Discord server.

"Protonwar" is an action-packed, multiplayer-focused AFPS game that offers both room-scale VR and non-VR play. It supports 2-player co-op, single-player, and PvP matches, and can be played offline against bots. Locomotion options in room-scale VR include teleportation-only mode and an advanced mode with multiple locomotion options, including controller gesture-based jumping and tricks. Be warned that advanced mode may cause VR sickness for some players.

In "Vox Machinae" , pilot a massive mining machine in the Serus System and protect your company's resources from a hostile force. Customize your Grinder with various weaponry and engage in an immersive single-player campaign or seamless multiplayer action. This tactical VR simulator boasts responsive action and is built for a seamless VR experience.

BREAK ARTS III is a dynamic robot competitive sports game emphasizing deep customization and strategic mech-building. Players create unique robots tailored to various terrains and challenges, testing their piloting skills in intense battles. With over 200 unlockable modules and stunning visuals, it combines action, strategy, and creativity in a thrilling competitive experience.

"Outpost: Infinity Siege" is a strategy game where players build their own outpost, gather resources, and explore different zones. The Vanguard Edition includes exclusive outpost components and a unique weapon with various attributes. Cooperative gameplay is also featured, allowing players to battle alongside others in various difficulty levels. Note: The above summary is based on the information provided in the game's description and is not an official summary.

"Hardcore Mecha" is a 2D side-scrolling action game with mech combat. Players can customize their mechas with various weapons and abilities, and engage in intense battles in single-player campaign or multiplayer modes. The game features a thrilling story of war, camaraderie, and betrayal in a world on the brink of collapse. However, the game has been criticized for its steep learning curve and lack of tutorials.