The Roblox version of the Employees act similarly to their canon counterpart and while they can be argued to be weaker due to not being able to break apart furniture no matter how many of them there are, the way it works in the game everything in Bloxmart is just freaking indestructible. Okay, maybe not "indestructible" but their durability definitely falls into the 9-B range.
You can literally build a base that is hundreds of meters in the air, drop any employee or object from that height and they'll both be completely undamaged. What I'm saying here is that the Player has to frequently deal with Employees that are not only as strong as their original SCP iteration but also far more durable. Now as to what the Player has over the enemy, they have items that they can consume immediately to restore health and stamina. They can deal damage by shoving the employee several meter away, throw or drop furniture on it, and possibly stab it with glass shards (we have never seen them weaponize glass shards in game but this could be due to the durability of the Roblox Employees not allowing them to as mentioned earlier). They can fuse objects to the floor in the monster's way to stop its pursuit and construct something to remain safe from it. With a combination of stealth and tactics, I think the Lego shopper takes this.