Sentry reminded me a bit of Orcs Must Die, but with a higher focus on being a first-person shooter.

The gameplay totally gave me the vibes of playing Engineer in TF2. Put down some sentries, fight some enemies with your gun, have the sentry run out of ammo at a crucial point and die to a random enemy because you are a squishy class punching above your pay grade.

The game is on early access and even the early access build is not out yet. On the good, the very little of what I saw appealed to me in a very basic way. I like the concept of the game and this goes a long way for me to enjoy a game.

Do I recommend it? Hell no. It's an early access game I haven't played yet. This said,  I personally am going to buy it because it appeals to my inner engie and this is enough for me.