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Very minimalist and cool! Great concept.

Thank you :) I hope its not too simple. People often think minimalistic designs are done with less effort.

Minimalist designs actually require a lot of thinking and brainstorming!
btw my suggestion would be to maybe add some sponge detailing (few circles of darker yellow) and add a "shine" effect on the clean part.

This is how it looks like in action (48x48 px):

So, the yellow rectangle is a sponge?