Looks good, though some sentences could be arranged in more than one way. For example, one of my sentences had the phrase "at the moment" in it. I think it was "At the moment I am arranging English grammar."
Problem is this sentence could be properly arranged:
"At the moment I am arranging English grammar."
"I am arranging English grammar at the moment ."
"I at the moment am arranging English grammar."
"I am at the moment arranging English grammar."
Most of the time, context like capitals and punctuation give enough clues, but strict adherence to one form when several could be used could lead to confused users.
A simple fix would be to stick with less complex sentences with no unnecessary clauses or phrases.
An unrelated complaint: The balloons occasionally were "dropped" for what seemed like no reason.
Neither of these issues keep it from being a useful tool though. Good job.