Blontops is an action game, where the player tries to explode the incoming balls, before they hit the bottom of the screen.

 Highlight the incoming balls by clicking on them. Then, press space to explode the highlighted balls. Only one color of balls can be selected at a time, unless special balls are used. So, clicking on a ball with a different color will unhighlight the previous selection.

 {"q": "Use slowdown powerup", "e": "Use exploder powerup", "space": "Explode highlighted balls", "fire": "space", "jump": "na", "p": "Pause/unpause", "r": "Use selector powerup", "esc": "Quit game", "w": "Use paint powerup", "movement": "mouse"}