This was a quick game made in 2 days for a game jam, so please excuse any bugs and lack of audio/music. I'll add those elements and fix bugs after the contest is over.
Click to fire smart bomb.
Destroying green planets gives you faster smart bombs.
Destroying red planets gives you more smart bombs
Destroy multiple planets/missiles with one smart bomb and you get a multiplier.
Green and Red planets are finite, so you need to be accurate and maximize multipliers to get the highest score.
Highest score i've seen is 1300. good luck.
** have upgraded the game with many of the features that I didn't have in at completion of the game jam.
New explosion particle effects for smart bombs
Secondary explosions now kill planets/missiles as well
play again button to avoid going back to main menu
Will update more when I have some time. I think some of the suggestions like bosses and a quick tutorial are near the top of the list.