Just went through your comic! I hadn't read an action comic in ages, so it was pretty refreshing. I loved how, in the first episode, you were utilizing a variety of angles and "camera zoom levels" (i.e. how big a character appears in the image). The shot with the big screen, and then the transition to the next several panels, worked particularly well.
My suggestion would be to clarify the character roles and goals ASAP. Right now, it's very early on, which is a big part of the reason why I'm not sure where the story is going. It all felt okay until the end of the last episode currently available when you suddenly introduced another fighter, seemingly ready to continue the action. "But wait! I haven't even had enough time to get to know the main characters yet!" was my reaction.
Maybe in the next episode, you'll flip my expectations around and give the readers a chance to really get to know the main characters -- not their whole personal history or anything, but what they're trying to do. Stuff like earning the prize money/ showing off their fighting prowess is all good, but give the readers a hook. Why should the readers care more about the brothers getting the money than about any other fighter getting the money? Give them the answer to that question.
Right now, I'd say the biggest hook is what was said in the first episode: that the police are looking for the brothers. They didn't seem like bad people -- sure, they're not exactly the most well-mannered gentlemen, but they weren't going around beating up random innocent people. So if they've broken the law, there's probably an interesting story behind it, a compelling reason why they did it (maybe they were forced, maybe the society/their life shaped them to do it, or maybe the law they broke was total BS). Keep the action going for sure, but without making it action for the sake of action. Don't halt/ slow the story down while the action is going... Use the action to move the story.
As I said, it's still very early on, so maybe you were already planning on doing all that. But at the same time, is it really that early on when you consider how a lot of people are quick to click on that Back button if the first few pages don't catch their interest? Something to think about.
I hope I've made sense! Good luck with your comic
PS. Even though I didn't like the introduction of the new character at the end of episode 5 from a storytelling-centric point of view, I really like how different he looks!
Please critique my comic: Heart of Keol