Yea someone else had issues with the game being determined to be a virus, but it's just a typical unity build, I don't get why that's happening (never happened to me before in these jams)
Also, in terms of the key, you gotta find where to put the rest of the items first before the key will become useful (if you still cant get to the end, just watch the jam complete stream from yesterday(?), I played it mid way through so you can see me playing it through)