Feedback about Some of the art I created / selected for my puzzle game

Feedback about Some of the art I created / selected for my puzzle game

Hello, I would be happy to receive feedback about the textures, designs and backgrounds I selected / created for the levels of my puzzle game.

I'll be specially thankful for any tip regarding the colors,  I need the backgrounds to be clearly different from the foreground.

 

Thanks in advance!

Attachments: 
Preview
level11.jpg level11.jpg 172 Kb [8 download(s)]
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level6.jpg level6.jpg 122.6 Kb [8 download(s)]
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level22.jpg level22.jpg 211.4 Kb [8 download(s)]
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level30.jpg level30.jpg 201.5 Kb [8 download(s)]
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level21.jpg level21.jpg 245.3 Kb [8 download(s)]