You want to know whether or not you've made a good multiplayer game?
If you can play it with your sibling and reach mario-kart levels of button-mashing, swearing, and joyous victory cries, you have done just that. And not only has Drizzle Dash done that, it has done that BRILLIANTLY.
Now if you'll excuse me, I have a sibling to gloat over.
(being honest, I'm not sure we played it correctly. But sitting over the same keyboard trying to knock the other player away from the spacebar is both incredibly violent and fun.)