So I've been working on animation software for over two years. Part of me is very excited for launch so I can have money again ( I've been freelancing a minimum amount these last two years, and went car-less, moved, cut lifestyle into a third ). I should be wholeheartedly excited, but I'm feeling tired and generally sluggish regarding the project. I still make consistent progress, but it takes a lot of will power.
Part of me thinks it might be an aversion to sales. Part of me thinks this could have been built up so much in my head that anything short of overnight millions would be a disappointment (though I would be happy with 1500 bucks a month ), part of me thinks I might be scared of success ( or scared of surpassing my parents )(media attention), part of me fears the attacks that might come with success ( having something to lose ), part of it is the un-fun-ness of mature projects where the focus is on polish and bugs rather than broad new features, and part of me is scared of commitment: if I succeed I have to stick with this (freedom value), part of me wonders what will happen when more people become involved, if I will be able to maintain my creative direction, since I'm scratching my own itch. Part of me wonders if diet and exercise isn't a factor.
A combination, likely...
So while it's common to think of a release as a birth of something new, realise that you also have a significant loss. You will mourn that loss. Give yourself some emotional space to deal with the mourning.