It is unfortunate that the main menu does not work because I do want to play it again. I agree with AMagicRock to have an indicator that the material has changed, because I did not even realise that I had to collect a different type of trash after awhile. I think the colour of the text's background should also fit the colour of the material, for example paper should be green, metal yellow, etc.
I also find that the slider and the rate of spawns is too slow. You could get stuck with a certain materials for quite some time that you can't recycle, resulting in you being punished for no reason other than bad luck.
The game is fun, and I think if polished, can get quite addicting (it is addictive already despite the issues!).