I fully agree. I’d love to see some options for those of us who are color blind.
Please add an outline to the targeting arrow and circle and let the player customize exactly which 2 color he/she wants to have for the filled and outline part. An outline would help a lot by separating the shape from the background more. This would also allow those who likes the current one to simply have the same colors for the filled and outline parts.
An outline color would also be appreciated for the ground circles since red on a green background makes it almost impossible to see for those of us with deuteranomaly.
Also, please consider adding a outline on the chat font. Depending on which zone you are in, it can sometimes be very difficult to read the text.
Letting us customize the colors in the options panel for various non-critical elements would probably be the best solution for everyone.