In standard English accent, the a (for example in father) is pronounced aah, not like a like apple. Personally, I think Australian English does not pronounce r in words such as art, door, and worker. The vowel in can't dance is closer to that in "kent dense" than in "cahnt dahnce" or "kaynt daynce," and the Broad version of I'm going there today sounds to some ears like "I'm going there to die."
Actually, the most important in a language is still the comprehension and not whether what kind of English you use or what kind of accent you have. If the listener understands you, then you are communicating. Obviously, the better your accent, the easier it will be, but most learners speak with some accent and it’s very normal. It’s very difficult to get rid of it, and only a very few learners, except those learning as children, can achieve it. The most important rule is to try to be consistent in your usage so that it will not sound awkward when you talk with other people.
