Generally I liked Cyra's kit, but some aspects of it felt very clunky or unreliable. In particular, while using her ultimate Cyra is unable to enter slime form between shots or use other abilities without canceling the ultimate.
Cyra's teleport "Ethereal Shift" has some interactions that are frustrating. It is possible to teleport yourself into pillars, for example. Her teleport can allow her to escape claypool ult, if she uses it right as he hits her with it she will not enter the arena with him. During the activation period of her teleport, if Cyra becomes crowd controlled the teleport goes nowhere which is very jarring.