Thanks for all the comments, and appreciate this is a sensitive subject. However, I really don't think that all the comments here are warranted - I will try and keep the eye on the ball. A few comments towards some of the feedback in here. Please try and keep the comments on the game.
1). We do in no way take the subject lightly. We have actually spend a lot of time researching this, and trying to thread a very thin line. We are definitely not making it into a joke. I have never heard anyone claim that we were racist with this game. I think it is a pretty harsh term to use based on a video. If you will enlighten me to exactly what parts you think are distasteful we are listening but general claims are very hard to do anything with.
2). I think it is a real shame that a lot of people are so ignorant towards the potential of games for more than entertainment. Like any medium or tool it can be used for good or evil. It is our aim to reach people that would normally not reflect or learn about this subject. Furthermore, I have a feeling that many of the negative reactions in here are knee-jerk reactions and she eps following what other says. Please take time to look at the game before forming your opinion.
3). In terms of what games come next all the games suggested all exist, and have actually for many years. Some of balanced and educational form. Others in propaganda games from political organizations.
4). I grant that the stacking of slaves in Tetris is a borderline example (it makes up about 30 seconds of the entire game) but please allow me to explain the point. Slave ships was actually almost stacked like you do in Tetris (google stacking slaves, and see the images) as you had to very careful to make the most room to earn as much money as possible - things had to fall into place. As such we try in the game to communicate the absurdity of the past. Our experience is that in the game it really gets people to think about just how absurd and cruel it is - trust me nobody is laughing or finding it a joke to play that kind of Tetris. They do however get a ahaa experience that will indeed haunt them. They will also discuss afterwards, and most of them will probably remember more than did from most their history lessons.
Bonus info: The game is used in around 300 Danish schools, and has been for a few years but recently we updated in with several new languages.