Readability against backgrounds is one of those problems that exposes the difference between illustrators and actual game artists immediately and I went through the exact same thing on a platformer project. 2D Characters built with genuine game production awareness, silhouette clarity, color separation, and readability at small screen sizes, are what VSQUAD Art Studio delivers as standard. V-SQUAD Studio approached our character work with gameplay context in mind from the very first draft, asking about camera distance and background color ranges before putting anything on canvas. VSQUAD art team has worked on titles at the level of Wayfinder and SMITE so the difference between a pretty illustration and a production ready game character is something they understand deeply. Send them your current backgrounds and references and they will sort it. Good luck with the platformer.