Go for it!
I'm working on NanaGram (https://nanagram.co) solo and bootstrapped. Although I'm not making a full-time income yet, it's generating a profit. It's mostly automated.
NanaGram is the 3rd greatest generator of happiness and fulfillment in my life (after my wife and my dog). I get a constant stream of good vibes from customers, most recently voicemails from grandmothers! (https://nanagram.co/blog/feedback-by-vm)
Good luck :)