Suggestions:
1) Don't use capitals and lower case letters in your word balloons. Comics use all uppercase.
2) get some better special effects. Your POWs BAMs and BOOMs are lackluster.
3) Stick to one font for your dialogue. Multiple fonts CAN look good if done right, but unfortunately, most people don't do it right. And don't use Comic Sans. Go to a free font site and get Anime Ace, or Handlettered, or something the pros use.