Hi,
Having play-tested your game before, I think the price could be dropped by $1.00. You're up against a market that is very competitive where some developers charge the same and has slightly better art and smoother game mechanics. Video games are very visual so if you are not capturing people with graphics first then, you are mostly at a disadvantage and game players are mostly very cheap and there is a business mindset disconnect. Most developers do not want to invest in proper assets or contractors but want game players to invest in their game.
It's not always about the amount of levels or content, it is about the presentation. Your game has to look fun for people to want to give their money and unfortunately they will not know the fun until they play it.
I believe with some better art assets and some more polish, this game could be priced at $5.00. I deeply believe games should be priced higher to keep the value of art sustained but I will keep it relative to your question at hand.
I hope this helps.