I'm an adult, and I wouldn't consider Alex a role model. I just think the response here is overly negative.
I admit, I'm not sure how Alex didn't find some of these bugs on his own. I think he might have rushed the demo release. It's probably because of the fangames that are being worked on. These games are a threat to the crowdfunding campaign's success. Why would someone donate to the campaign when there are fangames that are being released for free? So he had to put the demo out as fast as reasonably possible, and then fix the bugs afterwards, which he is doing.