It sees some use in harder difficulties due to the tougher enemies, but on easier difficulties it's usually overkill and not worth the risk of killing your teammates. Big splash range when things get crowded but causes extremely high friendly fire damage plus the shots arc instead of flying straight. Most of the time you can get the same effect just by dropping a freeze grenade at your feet.

The Smart Bomb is certainly an effective weapon if you're being overwhelmed by aliens, but it's single-use and ends up being tremendous overkill in most situations.

Its only real use is in speedruns, where it can be used as a valuable timesaver. Both take up a slot that could be much better utilized. However, you're limited to teleporting to places on your screen, and only places you could reach on foot.

It will also zap any enemies around both ends of the teleport. It has unlimited uses, but a lengthy recharge time. The first is your only jumping option in the game, but has very few uses and can't do much to enemies.

Each can only be found on a specific stage.

There are two hidden items in the game: The Assault Jets and The Blink Pack.

Also, the chainsaw is often used by speedrunners, as it can be used to both remove the boulders in the last mission without using the slower mining laser and break down doors faster than opening them by hacking.

A good chainsaw user can simply run into a mob of aliens and leave chunky bits in his wake, while anyone attempting to punch his way through the mob would simply get mauled between punches. However, unlike the standard melee attack, you can move freely while using it. but so can the standard melee attacks, and those are less likely to get you killed or wounded. Complete with a big 'shoot here' fleshy part on its rear.

Alien swarm first person mod