I think that it will be good that you can upgrade weapons.
So,here are list of some upgrades:
Spud gunlvl.1-like in bully 1
lvl.2-more ammunition
lvl.3-more damage
lvl.4-more damage,accuracy
lvl.5-Sniper spud gun
Bottle rocket launcherlvl.1-like in bully 1
lvl.2-more speed,accuracy
lvl.3-more ammunition(4 tubes),bigger splash radius
lvl.4-more speed,accuracy,damage
lvl.5-more speed,accuracy,ammunition(5 tubes)
fire crackerslvl.1-like in bully 1
lvl.2-more damage
lvl.3-bigger splash radius
lvl.4-more damage
lvl.5-bundle of firecrackers
(like in 2. nerd boss battle)
Stinky bombslvl.1-like in bully 1
lvl.2-bigger splash radius
lvl.3-longer duration
lvl.4-bigger splash radius
lvl.5-longer duration
itching powderlvl.1-like in bully 1
lvl.2-longer duration
lvl.3-bigger radius(2 persons)
lvl.4-longer duration
lvl.5-longer duration
wooden hand weaponslvl.1-normal
lvl.2-longer duration(more punches instill it breaks)
lvl.3-more damage
lvl.4-longer duration,ability to stun opponents
lvl.5-more damage,
other hand weaponslvl.1-normal
lvl.2-longer duration(more punches until it breaks)
lvl.3-more damage
lvl.4-longer duration,ability to stun opponents
lvl.5-more damage,
trowable weaponslvl.1-normal
lvl.2-longer range
lvl.3-more damage
lvl.4-longer range,more damage
lvl.5-longer range,more damage
GOO troverlvl.1-normal
lvl.2-more ammunition
lvl.3-stickier goo
lvl.4-more ammunition
lvl.5-more ammunition,stickier goo
UPADATE 1.
Eggslvl1.Like in bully 1
lvl2.More ammunition,bigger damage
lvl3.short stun
lvl4.more ammunition,longer stun
lvl5.SPOILED EGGS!(more damage,long stun,more ammunition)
stun gunlvl1.Short stun
lvl2.longer stun
lvl3.more damage
lvl4.double stun(2 peoples)
lvl5.triple stun,(3 peoples),longer stun
Will be updated