This has a pretty solid concept. Fighting tooth decay in the microscopic world of someone's mouth. My main issue was just that this version of the game was difficult to play. With the controls being a bit sticky and glitchy.
Otherwise I think folks over the years haven't gone nearly far enough with the concept of fighting tooth decay. You could make a very fun world that pokes fun at itself and create a whole fantasy universe about being a Knight saving teeth and fighting tooth decay. I'd say if you polished up the controls a bit and expand it you might have something there.