I'm the maker, and listening to any of your questions here!
What happens if 2 or more people send fund at around same time. Will it wait and spray one after another? suppose filling water takes time, it might spray non-stop if gets quite active with transfers :)
Awesome project! Why does it shoot water from the nose though, shouldn't it be shooting from the back?
No this is a sperm whale. It has different characteristics. It is not even centered actually. You can lookup the spermwhale and see that it has it spout / nose on his 'nose' actually :P
can it spray on people walking there?
haha . yes. When I recorded the video (see youtube vid in the bottom of the site) it actually sprayed a couple of times on us.