Bomber Space is an awesome game and will surely be what are you looking for. There are 6 levels with interesting and simple gameplay.
To go to the next level, you just have to kill all enemies and get the high score before the limit time's up. Use jump button for jumping, bomb button and fire button for killing the enemy and use virtual joystick to move. Do not let you fall, it's game over and be carefull there are many obstacle. Have fun!