I realized that player width can't be less than about 380 pixels.
Try to generate code with for example 200 and 350pixels, both widths looks same Solution for this maybe can be advice to make player smaller (smaller all elements, <>, volume, tracks names), or maybe better with one more parameter - general scale factor.
In embed code generators I like to see select all and copy buttons (or just copy code like videohive player), but it's not required of course. It's just suggestion :)
Thanks for this.
Looking forward for improvements.