Full disclosure: I used Batari Basic for this one so while it can run on a 2600, it wasn't the original 6502 Assembly Code.
Main limitation is you are allowed 5 things on the board: Player 0, Player 1, a missile for each and a ball. Any game which shows more than that has to do some very quick switching out which flickers to get it all on screen at once. The second player was the dog and it's why the feathers were lines. Music is doable (a bit) but a pain so I just kept it to the SFX.
Main complaint people have is the collision which I will try to fix. Thanks for playing!