I think the game is interesting. managed to get 85% yield at best with just few minutes of play. personally i'm not interested enough to try to get 100% but that's not because of the game play and just personal interest.
the visuals are very nice and it's simple enough to understand with just a bit of playing around. very well done for something made in 30 hours. i also like that i didn't need to be incredibly precise to get a high %, it seemed like there were grace zones when changing the stats.
hope ya'll continue with game dev, if this was just 30 hours to make, i'm sure you'd make a great game when given all the time you need.