As an indie dev who are making games mostly as a passion I have a really hard time wrapping myself around the business part, I try to stay away from it to be honest because I find it so boring. There is one thing I sometimes worry about though and that is Trademark. What if I release a game that gets popular and later some giant (like King) does a game and decide to use a name that is close to mine and they get a trademark and decide they want to take me down? I have no protection then, even though I made a big successful game even before they made theirs and got their trademark?

I have a game that is in the same vein and success as for example Hero Siege https://play.google.com/store/apps/details?id=com.panicartstudios.herosiege&hl=en

It seems that game is also made by some single person without a trademark on it. What if some big fish would make a game called "Candy Crush: Heroes Siege" for example now and they trademark that. Could they say he have to take his game down even though he was first?

Going through all the trademark registration things sounds like a real pain and I don't really want to do it if I don't need to. I don't care if anyone else would make a game similair in style or name to mine if they want to so I don't really care about that kind of "protection". But I want to be protected from someone being able to take my game down :/ I am a bit confused on how all this work, could someone enlighten me?