one per account and its free. when i donated today it gave me 4 copys. i just need 1 the next 3 people get it free if you want it.
https://www.humblebundle.com/?gift=BBCNtYFywhT3YnZ5
want to see gameplay take a look
i will take it down once all 3 are clamed
its free at humble bundel
get it here https://www.humblebundle.com/store it just under the title. use a email you can log into. they send the steam code to it. enjoy