As you probably already know, Min Hero is a Flash-based game.
Back when it was released, you could mostly play it online on websites like Kongregate, Friv, etc etc. There were (and still are!) ways around this of course, but thats a topic for another page.
Since Adobe stopped support for Flash, you couldn't play flash games online anymore. Including Min Hero.
Then people came up with alternatives - such as Ruffle! Which is what this website uses so you can play Min Hero online once again :)
If the screen is too small, right click the game and pick " Fullscreen " ! Enjoy ~
Note: it's a little slow but it works I promise