This is the safe route for any% Gunvolt Normal difficulty. Do keep in mind that abilities will vary per other character such as: Ekoro, Ray, Kurona, Copen.
This rough guide will be divided and will only really talk about when to upgrade your weapon in a safe route. Each level listed is a sequence to retrieve a certain upgrade and quick level menuing.
LS = Level Start or Before selecting a level BB = Before the boss, the room before a boss room
This upgrade route is based roughly on the cost points you collect. There may be times where you might be off by a few points unfortunately.
Main Stages --
City: for safe route, when you complete the level, instead of selecting the 300 Cost Point upgrade, Select Septimal Shield. This will halve and reduce damage by 75% with the proper upgrade points.
Radio Tower: BB Slot 2 0.5 Shield
Highway: LS Slot 3: 2x jump BB Slot 3: 0.5 shield
Military Base: No change; stick with Slot 3
Mine: LS Slot 3: Add 3x jump BB Slot 4: Add 1.5 Damage
Power Plant: LS Slot 3 add 0.25 shield BB Switch to Slot 4
Water Works: LS Slot 4 add 2x jump and 0.5 shield
Oil Platform: LS Slot 4 add 3x jump
Capital Building: No changes
Wily Stages --
Gateway: LS Slot 4 add 4x jump BB Slot 5 add 2x attack
Subspace: LS Switch to slot 4 BB Switch to slot 5 and add 0.5 shield
Distopia: LS Switch to slot 4 and add 0.25 shield BB Add 2x jump to slot 5
Cyberspace: LS add 0.25 sheild