Only one comment about your question...if you REALLY WANT a more firm answer to your question you REALLY need to tell us more about the recipe, like HOW MUCH sugar did you add and to WHAT type of recipe.
This info would allow us to better answer your question and come up with alternatives to help you improve your present batch.
In my mind, us saying "your beer is going to be OK, a bit more alcoholc in flavor, but light in body" may not be the type of answer you may be satisfied getting.
With that said, my comments are in the above paragraph.
For example, You could also boil up another 1/2 gal of water and add 4 oz of malto-detrine to the batch. The MD is not fermentable, but it will add more body (mouth feel or thickness) to the batch. You may also want to compensate any sweetness by adding more hops.
These are all possible answers that could be replied on if we knew more about the ingredients and quantities used for the batch in question.
Just remember, our goal here is to help you. So don't think I'm scolding/mad/yelling (at) you.
In all, I believe your batch will be alright. Later.