Lava flows are bright orange-red with heat haze pixel effects. Mettaton’s stage now has rainbow-colored spotlights that shift during his quiz show.
Once you have the working, why stop there? Many android ports support additional texture mods simultaneously: Undertale Colored Sprite Mod Android
: You must own the original PC files from Steam or DRM-free versions. Patch the Data UndertaleModTool on a PC to replace the file (renamed to assets/game.droid for Android) with the colored sprite assets. Build the APK Lava flows are bright orange-red with heat haze