there a 2 glitches
1 . you can survive easily if u go in the lower parts of the bunker and keep door open you could prevent this if you set it to have a y axis that changed on were it is to have the illusion of gravity
2 . if you close the bunker door and the enemy is inside they will stop as well you can prevent this by adding a script that allows the enemy to carry on its action if it reaches a certain area on the x axis
but nice game anyways