Great little classic arcade game. I love the inclusion of a difficulty switch that isn't just "more trash" or "fewer coins", but a genuine change to the way you think about the game.

Game's simple, but I have encountered no bugs and played for a while trying to get a high score. 

As constructive criticism, I think the game would benefit from implementing different mechanics for each type of garbage items, because right now the game is easy and it plays all the same no matter what garbage item you encouter. To increase the challenge, maybe there could be some type of penalty for not getting the collectables before them reaching the bottom of the screen, that way you cannot just stay in your place while surrounded by danger, but you would have to risk dodging the garbage.

Oh, and thanks for the message about polluting oceans!