"Well meet again" ... Ending of Berserk Boy?!

[Rongkong Coma]

I have played through all the 15 levels of Berserk Boy and get the Steam Achievement "Well meet again" and thought it was the end.
Now I read here something about a true ending.
Is that right?
I am not a real fan of earning all achievements on Steam.
Only when it is fair and beatable for a casual gamer like me ... like in games like "Astro Aqua Kitty" or "Flashback 2" and some other games.
But when I get something wrong and have not reached the true ending of Berserk Boy it would be nice to know what I have to do to reach the "ture ending"!?
Hope someone can help me with this ending thing.

[therks]

I mean, that didn't even feel like an ending to me. No credit roll, just dropped back into the hub. Talk to Dizzy, then talk to the old man, then talk to him again when you've collected 20 medals, then go to the area to the far-right of the main hub, then talk to Dizzy again.