How much Skill points would you need to buy certain powerups/upgrades, then? Max Ammo - 10 Skill Points, Nuke - 8 Skill Points, Insta-kill - 7 Skill Points, Double Points - 5 Skill Points, Carpenter - 2 Skill Points, Fire Sale - 5 Skill Points, Bonfire Sale - 8 Skill Points, Death Machines - 5 Skill Points, Random Perk Bottles - 5 Skill Points. Maybe this is too expensive. But, It's just a suggestion. Besides, I think buyable power-ups should be expensive. I also mentioned using Skill Points to Upgrade your weapons. I was thinking 3 Skill Points for each upgrade. When I say Upgrade I mean damage upgrades, ammo upgrades, clip size upgrades. Say each time you buy Ammo Upgrade on your weapons, you get 20% more bullets/shots. Clip size upgrade will extend the clip size on your weapons. Each time you buy Clip size Upgrade on your weapons, you get 20% more bullets/shots in each clip. Damage upgrades will give you 20% more damage on your weapons each time you buy a Damage Upgrade. You might ask yourself. How many upgrades can you get for each weapon. In Ammo Upgrade - 5 or 10 times. In Clip size Upgrade - 5 or 10 times. In Damage Upgrade - 5 or 10 times. You can upgrade 5 to 10 times for each upgrade types.