Colossal, Spanish film-maker Nacho Vigalondo’s biggest film yet, is a quirky genre-bender with a fatal credibility problem, one entirely unrelated to its central conceit, a preposterous, cute premise engineered to attract eyeballs across the indie-blockbuster divide. Anne Hathaway exec produces and stars as Gloria, a thirty-something party girl dumped by her boyfriend (a condescending Dan Stevens) after one all-nighter too many. With no job or place to stay, she has to leave New York for the family home, which lies empty and unused in her small childhood town. While trying to sort her head out and organise something comfortable to…