「まだ遊びたかったよね」は
ーYou wanted to play some more, didn't you?
ーI know you wanted to keep playing.
のように言えます。
例:
I know you wanted to keep playing, but it's bath time.
「まだ遊びたかったよね、でもお風呂の時間だよ。」
it's xx time. で「xxの時間だよ」
I know you wanted to keep playing, but it's time to go home.
「まだ遊びたかったよね、でもお家に帰る時間だよ。」
it's time to ... で「…する時間だよ」
ご参考まで!