[slamus]

Thanks for your answer but:

1 - He payed me for my work as an employee of is company

2 - Don't want to get lost into legal stuff, since I've got so many other things to care for (work + family + enjoying my life :) )

[computer]

If you got paid as an employee to build the app, his position isn't as weird as it seems (ignoring verbal promises). After all, he had already borne most of the risk at that point.