On Android, the layout adapts to a touch screen automatically — the faders, switches, and volume control are all sized for fingers, not a mouse cursor.
You can add this page to your Android home screen from Chrome's menu for a one-tap, app-like shortcut. Some Android phones also include a system "Sound Enhancer"; try turning that off if the tool's changes don't seem to be taking effect.
Because the tool never installs anything, it uses no storage space on your device beyond a small browser cache, and it never asks for microphone, contacts, or file-system permissions beyond letting you pick a single audio file to play.