This is so nostalgic. I remembered back then when I tinkered my beyblade and try out stupid combinations or additions on them.
The gameplay itself is too simple though. Sure, real beyblade "battles" are very randomized and purely depends on luck and the customization, but this is a web game, not the real one. The chance of winning by arena out is so small that whoever has the most stamina wins most of the time.
Probably make it so that we have more control on it, like some kind of control or better specials. Maybe make it so that each body can provide different special.