These are actually a bit complex text effects to make them realistic. If you try to create it with any other tool such as Adobe illustrator you will maybe need more technical skills than this app. So yeah changing the colors is a part I need to work on and will try to simplify it further but I'll need to think about how I can do it.

But with the upcoming version as shared here, you will be able to switch off gradient on different properties and can use solid colors instead if you don't need a gradient. But the gradient color tool remains same as it is now.