You dont have to brake your head. Just gimme me the option to choose a solid color for the background from the settings, or have like 3 different background images with different colours for me to choose.
A different background colour might be enough contrast so you wouldnt need to change the blocks and the outline colour and still have the player be able to understand whats going on and be confortable.
The gameplay was fun, but sometimes was really frustrating trying to understand what was going on.
Its a totally different game but cockie clicker default grandma invasion background is horrible...
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But, you can unlock fairly easy a background selector. Its really simple but its a must.
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Hope this helps at least a little bit brainstorming ideas!