I am embarrassingly bad at this game lol
I ended up just mashing space until I figured out the timing for hitting the shuttle, which felt like cheating; I'm not sure if there is a penalty for this at all (well, in real life, my arm would get tired) or if it's possible to miss while "recovering" from a swing. Probably people like me could benefit from some more assist early on (like an height indicator that shows about when to swing or something)
That said, the 3D models are really cute and it's a fun, nicely built idea! Grats!