The phrase "slight resemblance" means there is a small similarity or likeness between two things, but it is not very strong or noticeable. Full definition
The game, which successfully sums the entire action RTS genre in its title alone, is a top down third person tower defence and offense game bearing slight resemblance to Dungeon Keeper. (illgaming.net)
But despite a slight resemblance to John Hodgman, the actor who plays the boring establishment type in Apple's «I'm a Mac» commercials, Nokia's new CEO is no wimp, either. (canadianbusiness.com)
The «church» we usually find now bears only a slight resemblance to the original. (redeeminggod.com)