Sorry, I know the film only second-hand. I could provide the tenti-scene though.
(Unfortunately, it's on Zippyshare, not Filejoker. The link is on "Tentispotting"
on YahooGroups very recently. Maybe one of the regulars could DL and reup.)
For fuzzy values of "tentacle movie" (only a short scene) and "good" (it's consentacles, YMMV on that), try out "The Untamed", www.imdb.com/title/tt5265960/