like wall, but it has an entry point (specified on build/creation).
from this entry point units can enter the tower
this entry point can also be used to leave the tower
gate:
like wall, but units on it can open and close it
a gate has an direction (up+down pr left+right)
when open units can freely go to the gate tile in the gate direction
when closed the gate is just like a normal wall
units on the gate are not affected by its open/close status
when a unit is already on a tower, wall or gate tile, it can just go freely to other tower, wall or gate tiles, but only on tower
add new feature: allow multiple units to be on the same tile
buildings can lower the maximum amount of units
units can either enter the tile or the building (if there is one)
buildings have their own amount of maximum entered units
add new buildings to allow users to protect their territory wall:
tower:
gate:
add new feature: allow multiple units to be on the same tile