I don't know about Ghost. It seems unfair to snipers. It sounds cool, though, maybe something else regarding sneaking? And for Martyrdom/Final Revenge, maybe you drop a random explosive from your inventory, so it's not like you randomly spawn a grenade. It could be a mine, rocket/grenade launcher fired at a random angle, grenade, or what have you.
Another improvement: The Weapon Expert could be for the type of weapon you get the most kills with (sniper, shotgun, pistol, SMG, assault, explosive, etc.). Weapon Master would be if you get a big amount of kills with a certain weapon, then it would only apply for that specific weapon.
If that's not clear enough for you;
Weapon Expert: You use a certain type of weapon for almost all your kills. With this type of weapon, you get +10 or 15% damage.
Unlocked by: 25 kills with the same type of weapon. They need not be in a row.
Weapon Master: Nearly all your kills are made with the same weapon. With that weapon only, you get +25% damage.
Unlocked by: 25 kills with the same weapon. They need not be in a row.
As well, I've been thinking and I realized that Blockheads really have no speed. You can't charge or sprint in the game. So I thought, what if the Realistic Player could sprint?
Ok, so the Jet Energy Bar would measure your energy/stamina. Holding C would let you sprint, but drain the energy while doing so. Normal walking would be at a jog speed. Sprinting would be, well, an all-out sprint. Standing still recharges sprint energy 2 times faster than walking. Sprinting would double your speed, but accuracy would decrease 2 times as much as when walking.
And if you do that;
Run, Forrest, Run!
You can sprint twice as long as normal, and your energy recharges 10% faster.
Unlocked by: Sprinting a lot? Anyone got some ideas?