The bad thing about most of these versions of Sans nowdays....
They are badly overplaying the role.
Like really outa character of Sans, the lazy bones. Who keeps his "lazy ass" mask up untill the words "should be burning in hell." And he doesnt even shouts those. No. Whenever dat skelly was serious, he was quiet, but distinctive. Kinda telling you clear enough, what he is gonna mess ya up, but without any unnecessary noize.
The animation isn't too bad, it's actually the only reason this movie got it's 3 stars.