this is game where you have a time limit in most moves and while you coordinating with teamates i dont see the importance of spelling correctly
You writing properly costs one person a few seconds. Your team mates having to decode some illegible text costs all of them time. Not to mention what happens when they misunderstand you because they decoded your writing incorrectly.
In the grand scheme of things, writing properly (and no, I don't mean flawless, but far better than you've been doing so far) actually saves time.
In Dutch you never place a comma before 'and', is that different in English?
Actually, that's not true... While Dutch indeed doesn't place a comma before the last item in an enumeration ("a, b and c"), there are other uses of commas and in some cases a comma right before "en" is not only allowed, it's required:
http://www.onzetaal.nl/taaladvies/advies/komma-voor-en (I'm reasonably sure this marks the first link to onzetaal.nl ("ourlanguage.nl") on the WL forum ;) ).
By the way, English does indeed differ here; to the best of my knowledge, a comma between the second-to-last item of an enumeration and (the "and" before) the last one is either allowed, tolerated or required (no idea which, go ask a native speaker :p ), but it's definitely not "wrong".
I think that is called an ellipse
Nope, that's a "flattened circle". Three dots denoting an omission are called an "ellipsis" (the plural of "ellipse" is "ellipses", pronounced differently..., I think).