Speaking to the Grimsby Telegraph, Slade praised four of the newboys.
"I was pleased with the lads tonight - the new signings did well," he said.
"Terry (Fleming) showed what he can do and Andy (Parkinson) proved he will be a good asset, while Whittle and Ramsden settled well at the back.
"It was a good workout and it was nice to look at both the contracted players and trialists in a proper match."