Actually the "game over" doesn't take into account your success in the level but is rather here to say that the level is over. Thanks for your feedback !
Feels so satisfying to clean. Only drawback is that in the bigger levels we wait so long for the snow to rain. Maybe you could add an arcade mode were the player is able to clean the snow while it piles up. I also quite like the effect of revealing the background by cleaning the snow !
You could definitely add more options to the player and maybe some easter egg (for example, we are able to jump over the doors, but what if you could then keep walking and ...)