Victor Cruz described it as “fun’’ late Saturday night watching the Giants’ backups overcome a 26-0 fourth quarter deficit to overtake and beat the Colts 27-26 in a wild preseason game at Lucas Oil Stadium.

“I had a blast watching them at the end,’’ Cruz said of seeing the youngsters stage the comeback.

No one involved with the Giants had any fun or “a blast’’ watching what transpired earlier in the evening, when Cruz, Eli Manning and the starting offense continued to make the task of completing a forward pass far more difficult than it ought to be.

In 23 days, the Giants play a game that counts, and their getting-worse-instead-of-better offense looks light years away from being ready for anything resembling competency.

The players who matter most on offense again got almost nothing accomplished, as Manning produced no points in four series of work. He completed only one of his seven passes, for 6 yards to Jerrel Jernigan. Perhaps the Giants should have stopped the game and retrieved the ball for Eli after that one. It was dismal and worrisome, and although these games don’t count a lick, there have to be serious questions how this new West Coast offense installed by new coordinator Ben McAdoo is going to function.

Coach Tom Coughlin said he challenged his team, trailing 20-0 at halftime, to “Come out in the second half and see who loved football.’’ He saw Ryan Nassib, relegated to the No. 3 quarterback spot, get on a roll, finally hitting (who else?) rookie Corey Washington for the game-winning touchdown with 55 seconds remaining — the third game-winning scoring catch in three games for Washington.

Of course, Nassib and Washington aren’t likely to figure prominently in the season-opener in Detroit. Coughlin stated “We are realists’’ and acknowledged “a very poor performance by the [starters].’’ He described the way the offense operated as “dismal-looking,’’ said it “wasn’t impressive at all’’ and added, “Whatever words you use to describe it, there’s no production and that’s disappointing.’’

Manning was coming off a strange 0-for-2 passing showing against the Steelers — the first time in his NFL career he left a game without completing a pass. Manning wouldn’t hit the panic button if it were the only button left to push, and he insisted there were some signs of progress.