The portal gun used by Wheatley and Chell are interesting ideas but some updates required and bug fixes.

First thing is it doesn't work on 80% of the materials and surface needs to be complete flat. New players do suffer with this because they can't seem to find any places to use the portals.

And second, it doesn't have any delay before you can use it again which means, players suffer from using it. If one use the teleport, he can accidentally teleport back again (as if it teleports you back to same spot). This can even cause crashes to players due to how much effects and sounds it releases. Some .seconds delay should be good enough for this.

Thirdly and don't think this is very important. New players usually believe that the portal gun is their weapon for killing... with a reason because you start holding it. Maybe adding a text on screen when portal gun and players collides saying "Your portal gun does not hurt Mercs" or in the description.

In addition, it is also possible to exit any map's boundaries when using the gun.

Yep, your not wrong there. Ive seen it used in death zones too which can be easy kills for the boss.

I agree, and this problem could be changed if the rate of fire was lower, atm it can be spammed quite freequently