[Self Promotion] Cat Box Paradox is currently in the Steam Spring Sale (£3) it's a colour swapping precision platformer. It's good....honest
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Save 40% on Cat Box Paradox on Steam
https://store.steampowered.com/app/1771200/Cat_Box_Paradox/
In this fast paced retro platform game, you must think fast as you run, jump and swap colour, making your way through 8 floors of challenging and amusing colour changing mayhem.
Give it a try if you like challenging, but fair platform games with a fairly unique mechanic.