About Iji

Weapons:
1) Shotgun (start weapon; infinite ammo)
2) Machinegun (Tasen lvl. 3)
3) Rocket launcher? (Tasen lvl 6; destroys weak walls?)
4) ?? (Tasen lvl 10)
5) Resonance Detonator (found in sector 2; infinite ammo; kick effect)
6) Pulse cannon (Komato lvl. 3)
7) Shocksplinter (Komato lvl. 6)
8) Cyclic Fusion Ignition System (Komato lvl. 10)

Combinations:
1+2) Buster gun
7+2) Splintergun
1+3) Spread rockets (destroys weak walls?)
?+4) ??
1+5) Resonance reflector
5+6) Hyper pulse (kick effect)
6+7) Plasma cannon
?+8) ??