I thought it was a very traditional tower defense game that we need to build multiple towers and update them to prevent enemy walk from one point to another point. But in fact, it’s more like a beachhead shooting game. 

I control a tower in the center of the map and then shoot around to prevent the enemy from approaching and damaging my defense. it's really better than my expectation. First, the gameplay is very common at all. At least there are not many games of this type in the games I have downloaded. Secondly, there are diverse levels in the game. For example, some levels are at night, you can only see the position illuminated by the searchlight. And snow level, the enemy will be frozen when you shoot them. Meanwhile, the defense tower can be updated in many ways. scattered bullets, lightning bolts, even lasers.