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Nice but there's a bug with the plasma cannon. When an enemy scores a direct hit on me with a plasma cannon it takes a huge chunk out of my health. But when I score a direct hit on an enemy with a plasma cannon it does not kill them. This is a direct hit from the gun, not the fragments that fly up afterwards.
Also the enemies should run out of ammo but they never seem to.
It would be nice if you could pick up extra health or grenade upgrades (like being able to see the trajectory of the grenade before shooting).