Oh, that is a cool one! I love that mechanic (have to show this my wife who in her childhood excessively played a pool billard game for Game Boy… that and Tetris, of course). Really satisfying asteroid explosions as well! A note to the start screen: I’d suggest to make the »Play« button look like an actual button to get a sense of actually colliding with it (btw, I really like that you already use the in-game mechanic in the start menu!). And maybe put the info about »smashing it to start the game« in a bubble close to that button. Cause I had not read that far in the beginning and was surely surprised when the game suddenly just started.
Congrats on keeping it to the 3 hours! The review deadline is getting closer and closer, so I try to get to one more of the Trijam entries now, but I’ll return to Asteroid Smasher… who proofed to me that arcade-likes can really profit from a modern technology like Drag’n’Drop. :)