Had a few problems playing this game to be honest, Firstly the opening text is like a machine gun in my ears for 30+ seconds.
I managed to find some sort of upgrade? the text popped up telling me what it was didn't last very long at all and i didn't see what it was, just "You can now....".
And finally i dug right down, there doesn't seem to be a trigger box to restart the level down there, was just falling endlessly.
Hope this is constructive! not trying to be mean.
I do like the idea though, cool little worm.
Another little tip, set your Sprites Images filter mode to "Point" for pixel art, it will remove the blur from the image.