Raid Monster Heroes is a free-to-play RPG game developed by Persona Game Studio for Android devices. In this game, you play as a general leading an army of unique monsters to fight against an alien invasion that threatens the Earth. With simple gameplay mechanics and a low entry threshold, it's easy to get started and become a hero in no time.

The game features a variety of monsters with inherent abilities that you can upgrade and evolve. You can also engage in player vs player battles to test your skills against other players. The game has a spore game and .io games style, which makes it even more fun to play. The game size is only 13 MB, which means it won't take up too much space on your device.

Overall, Raid Monster Heroes is a fun and simple RPG game that is perfect for those who want to enjoy a casual gaming experience. It's easy to get started, and the unique monsters and PvP mode will keep you engaged for hours.