After you defeat the first boss you get the bomb skill. I had to make the skill page in the menu, there you'll see the current effect of your equipped skill. Skills work with cooldowns, so that's what the third bar in the UI is about! There are ten different skills in 100RTBD, some of them are mandatory, others have to be unlocked!
Currently working on: Working on the first skill
Time spent on the project so far: 123 hours
Screenshot after the jump: Bomb skill