Hi! The imperfect tense describes an action that occurred or used to occur continuously (in the past). Then, the best translation to "Todo dia eu vinha te ver." is in fact "Every day I came to see you.", but in other cases when there is no time adverb indicate that the action used to occur in the past, the translation is different: "Eu vinha te ver." - "I used to come to see you". Therefore "I came to see you." means that once you "came to see" (simple past), which in portuguese is: "Eu vim te ver." (Pretérito perfeito). I hope that you understood it all :)

Oi, hello! Vir =to come.