The visuals and theme are good, it's also running smooth, didn't encounter any bugs. But I did find sort of an exploit: You can basically alsways move left and right very fast (without touching the trasher on the left) but always make sure to hit the collector on the right and you'll collect nearly all of them without effort. I'd suggest penalizing the player for collecting more of a color than fits so that the player has to pay attention to only collect the missing colored fluids.