1. Do you think the makers of Tetris would find reason to sue?
They could only sue with your usage of thier shapes, this is very unlikely as its already been stated there are tons os clones out there now.
2. Does it feel original?
Its a strange beasty indeed, as for originality it feels like tetris just without the lines :|
3. Is it too easy or hard (or just right)?
Once you work out what your supposed to be doing its not bad.
4. Is it fun?
No there is nothing to do but uncover words why not have pictures instead?
5. Is it addictive?
Maybe with bonuses it might work.
6. Does it have replay value?
Not at the moment.
7. Were you able to figure out how to play and what to do?
I finally worked out you had to 'guess' to get the second round started, this might be better if it was onscreen.
8. What would you change to make it better?
Have pictures instead of words. Also bonuses.
9. Does it have potential?
With a lot more work it might make it but its to limited ATM IMHO.