I assure you it has been described as just that by critics starting with Raiders. Its one of the reasons why Spielberg gets away with a PG-PG13 rating for those incredibly violent movies. Happy to provide examples if you're not convinced.
YOU may not describe them as such, but thats you, not me or film critics or the general public. Tongue-in-cheek is perfectly apt. Sorry.
Here's a google search that should clear things up for you:
the second page is particularly illustrative.
irregardlessly, i think an "Indy" tone would be just fine for this movie. Somewhere between Raiders and Slither.