2D shooter aiming system I thought of a while back, might be inspiration?

Button1: Enemy target select.
Button2: Target select, fire.
Button3: Friendly target select (For Medics and Spy Hunting

)
Hit button1+2 OR crouch, to reset your target selection (or Button1+Button3?)
Works like such:
Face a direction.
Press Button1.
See a floating crosshair fling out in the direction you face, locking onto the first enemy it spots.
Press Button1 to cycle to the NEXT enemy, AKA the one behind them.
Press Button2 to select a target and begin AIMING.
Whilst aiming, good sirs, ye do not mash Button2. Oh no.
Your elegant Aim bar fills from the left to the right, with accuracy!
If the bar is below half, you will miss completely1 (no mashing!)
If you press Button2 JUST AS the meter fills, ye do extra damage
(erm, not sure it it should be 300% critical.. just more damage.
Advantages: Timing-skill in aiming! Replaces those stupid 3D mouselook!
Advantages: Skilled players do skillful damage with excellent timing! Voila!
Advantages: Two target selection buttons means you can control who you're trying to kill at any time!
Advantages: See bullets fly to an enemy from your teamate, then target the enemy yourself!
(PS as you can tell I took the time to write this.. TF2 demake sounds fricken awesome, no I haven't seen Buddy Base)
(MY BAD. I didn't see the game was complete, I just rushed ahead with a suggestion.. downloading and playing now

)