Make no mistake, this is no Deus Ex. Moreover, except for the name and the fact that you're dealing with aliens, it has nothing to do with X-Com, either. Enforcer comes from a time when MicroProse thought it would be fun to slap the X-Com name on literally everything.
Still, there is fun to be had if you adjust your expectations accordingly. Enforcer is an arcade shooter through and through. No more than six buttons are required to play the game, and you can't even look up or down. There's not even a weapon selection—whatever you've picked up last is what you have equipped. Running on the stable and still nice looking Unreal Tournament engine, Enforcer looks and feels like a UT mod, down to the textures and the ability to dodge by double-tapping movement keys. Every single one of the 35 levels comes down to one thing: shooting everything that moves. Each level takes around five minutes to finish, and the only variety comes from the environments and upgrades you're allowed to purchase between levels. Unfortunately, the game doesn't really tell you what each weapon does, and since every additional unlocked weapon expands the pick-up pool, it's actually better to only unlock a select few weapons to increase the odds of the good ones showing up more often.
And that's it, there really isn't anything more to this game. Regardless of the difficulty level, the game is never challenging to any degree, and thus never goes beyond mindless shooting. That's not a bad thing, however, and I didn't feel bored once. Thankfully, the game is quite self-aware of its own premise, and you even get to fight an alien boss in a stadium, which is an obvious reference to Duke Nukem 3D. The enforcer saying "You have been enforced" while mowing down hundreds of aliens alone is worth the price of admission. In short, if you're down for some tongue-in-cheek shooting, do yourself a favor and get this on a sale.