One of the things i learn over this months in game dev,  is that in a game design level, is SUPER important the use of complementary colors.

Is good for 2D and 3D games, because are colors that makes the scene stand out.

And the BEST tool that i found online is FREE and is from Adobe, you can find it here:

https://color.adobe.com/create/color-wheel

Select complementary color, and just use the tool to put the color that you are using in your game, easy as that..

the result is great!

Hope this helps you !!!

Paul.