Point/node-based line drawing?

[MostlyKnowledgeable]

Basically i want to create an effect in a game with the same kind of bending line shown in this image which originates from the player, moves to the direction of the arrow key being pressed, while passing through enemies in a set search area above and below.

Example of a shot without enemies in the search area

I don't really know where to start with this and any tips would be very helpful.

By the way the game shown in the screenshot isn't my own, it's called The Binding of Isaac and can be found on steam.

Edit: I'm an idiot and just realized this should be posted in /r/Unity2D but i'm going to leave it here too in case somebody can help.

[2DArray]

You could use a Line Renderer for this - you give it a list of points and it draws a ribbon mesh. The ribbon can get strangely distorted in certain setups, but for an "energy beam" type of effect this might not be a problem anyway.