The spar would be medium in size and be focused around a special gun. I was thinking this gun could be futuristic. It'd have a m4-like fire rate (or slower, think AUG), extremely fast projectile speed, 100% accuracy and low freeze.

The projectile speed would be the feature of the spar. Your bullets/lasers would travel almost simultaneously, making strategy important. The whole idea is to make it even for both players and have the "instant damage" feeling of Classic's spar.

Even though the guns are the same, you could have two variants. A pistol and a rifle. If desired, these could differ in freeze VS. ROF. A gun with less freeze has a lower ROF than one with more freeze, for example.

The health system would be regular, except for a slowly regenerating health bar. So, even if your health is low... You can survive and win with skill.

Another item I was thinking about is a barricade. A regenerating barricade made up of boxes that are lying around. After being destroyed they come back a few minutes later.