chill, assuming they're preparing for a second season, most of those aren't even "problems". at the very least, it's a "NOW GO READ THE LNS" ending.
one thing i have to agree with tho is that i really disliked the adventure/fantasy atmosphere they set in the end, it was so much better back when the barrier was active and they all suspected each other.
and the overall budget was already pretty low on episodes 9~10, if you compare it to the first episode. not a specific problem with the ending lol.