check grammar please?

I'll try:

1. This chocolate is especially good for busy people/people on the go.
2. There are 31 flavors, one for each day of the month: like banana, swiss milk, cappuccino, etc.
3. Each package is designed to present a relaxing theme. To ease pressure at work is this brand's main objective.
4. 31 flavors per month/ flavor of the day
5. You'll have a world of choices.

This chocolate's target market is working people OR people at work. (professionals? labourers?)

It offers a different flavour for every day of the month, from banana to Swiss milk to cappucino.

The different packaging solidifies the brand identity by depicting the break this chocolate offers to people in a variety of difficult situations at work. (Probably better to start with the brand identity)

31 days of taste every month

Available all around the world (don't know if that's what you mean)

Unfortunately, this makes very little sense at all. You need to study English grammar and especially SYNTAX more before you can attempt to write something like this. You cannot just take Japanese and translate each word or phrase into English, because we construct sentences differently than you do and it will not make sense.

What do you mean by "your chance"?