Homage to the origins

SaltyEgg, the creator of this game, explicitly mentioned some games as origin of effect to Toon-Shooter -- Area88 (a.k.a. U.N. Squadron, U.S.NAVY, Carrier Air Wing) and R-Type -- in the prototype version (eggwar )

Inspired from Area88

 * Players' vehicle have certain HP and equips some Special weapons.
 * You can select a vehicle.
 * You can make (in-game) money and buy additional equipment.
 * Appearance of enemy shells resembles between Area88 and this game.
 * Also sound effects.
 * The hardest difficulty is called GAMER mode.

Inspired from R-Type

 * You can charge energy of shots like Wave Cannon.
 * Helper in Toon shooter is inspired from Bit Device.

Inspired from Gradius

 * Some ships have multi-directional shot -- double, tailgun.

Inspired from Darius

 * Progress of the stages forms tree structure (original flash version).

Special weapons

 * Bomb
 * Area88 - Bomb


 * Homing
 * Area88 - Phoenix Missile


 * Ring
 * Area88 - Cluster Shell ?


 * Plasma


 * Surfer
 * Area88 SNES - Falcon Missile


 * Diagonal
 * Area88 - Gun pod


 * 3way
 * Area88 - Thunder Laser


 * Crawler
 * R-Type - Yellow Laser Crystalas Counter-ground Laser


 * Rainstorm
 * Area88 - Mega Crush


 * Laser


 * Melee


 * Napalm
 * Area88 - Napalm


 * Rear


 * Comb

The Village

 * In the way
 * The Crushinator
 * the name was taken from Futurama and the design of the head was taken from shockwave from transformers.

Sky Line

 * In the way
 * Area88 arcade mission 2 "Stealth Bomber" [video]


 * Skybreaker
 * star destroyer from starwars

Risky Woods

 * In the way
 * Area88 arcade mission 3 "Jungle" [video]


 * All Terrain Armoured Tank
 * "Land Aircraft Carrier" from Area88 arcade mission 4 [video ]

==== Desert / Desert Fortress ====
 * In the way
 * Area88 arcade mission 4 "Desert" [video ]


 * Castle Hydra
 * "Fortress" from Area88 arcade mission 3 [video ]

Purple Sea

 * In the way
 * Area88 arcade mission 8 "Sea" [video ]


 * Herve
 * "Minks" from Area88 arcade mission 8 [video ]

Space blockade / Underwater Laboratory

 * In the way
 * R-type stage 4 "Frontline Base" [video ]


 * The Pride (Rise of the fleet)
 * the van is from Futurama.

Atomic Boys (The freelancers)

...

Bio Lab

 * In the way
 * Gradius Ⅱ Stage 6 "Maximum Speed" [video ]


 * Kojorius
 * "Bellmite" from R-Type stage 5 [video ]

Cargo System

 * Dance of the Vans
 * R-Type stage 6 "Transport System" [video ]

=== High Mountains ===
 * In the way
 * Area88 mission 5 "Attacking to Bayson" [video ]


 * Bruticus
 * Compiler from R-Type stage 4 [video ]

Dock / Vortex

 * In the way
 * R-Type stage 3 "Gigantic Warship" [video ]


 * Command Ship Tyberius
 * "Warship" from R-Type stage 3 [video ]

Town under Seige

 * In the way
 * Area88 mission 7 "Bullhead" [video ]


 * Bull Ox
 * "Bullhead" from Area88 mission 7 [video ]

The Hive

 * In the way
 * R-type stage 5 "The Den" [video ]


 * Cancer
 * Unnamed Boss from Area88 SNES area 9 [video ]

Guardians Gate / Scrapyard

 * In the way
 * Boss Parade from Gradius series. [video]


 * The Seven (Rise of the fleet)
 * "Phantom Cell" from R-type Ⅲ stage 5 [video ]


 * Recycler (The freelancers)
 * "Bronco" from R-Type stage 7 [video ]

=== Cavern ===
 * In the way
 * Area88 mission 6 "Cavern" [video ]
 * Area88 SNES mission 9 "Cavern" [video ]


 * Lord of the Owls
 * "Bydo Core" from R-type stage 8 [video ]

Decayed City / Mutant City

 * In the way
 * R-type stage 7 "City in Ruins" [video ]


 * Ignito
 * "Rios" from R-type Ⅱ stage 4 [video ]

City Invasion / Wasted City
Carrier Airwing stage 2 [video]
 * In the way
 * Blackbird
 * "Blackbird" from Area88 SNES area 8 [video ]

The Long Tunnel

 * In the way
 * Area88 SNES area 9 / U.N. Squadron area 10 "Tunnel" [video ]


 * Gnasher
 * "Seabet" from Area88 SNES area 6 / U.N. Squadron area 4 [video ]

=== Acid Cave  ===
 * In the way
 * Basically R-type stage 2 "Creature Cave" [video ]
 * and R-type Ⅱ stage 2 "The Cave" [video ]
 * Acidic rainfall from R-type Ⅲ stage 2 "Acid Creatures" [video ]


 * Tumbler
 * "Creature 666" from R-type Ⅲ stage 4 [video ]
 * Some features might based on "Necrosaur" from R-type Ⅲ stage 2 [video ]

=== Secret Construction Base ===
 * In the way
 * Basically R-type Ⅱ stage 5 "Additional Base" [video ]


 * Metroplex

=== Tainted Depths - Karnivore ===
 * In the way
 * R-type Ⅱ stage 6 "Bydo Empire" [video ]


 * Karnivore

Space Junkyard

 * In the way
 * Basically R-type Ⅱ stage 3 "Gigantic Warship" [video ]


 * Satellite Straxus
 * "Recojunator" from R-type Ⅲ stage 4 [video ]

=== The Den ===
 * In the way
 * Basically R-type stage 5 "The Den" [video ]
 * and R-type Ⅱ stage 6 "Bydo Empire" [video ]
 * Bubbles from Gradius Ⅲ stage 2 [video ]


 * Royal Embryos
 * "Womb" from R-type Ⅱ stage 6 [video ]

=== The Fleet ===
 * In the way
 * return of the jedi "battle of endor" video


 * Cyclonius / Halcyon
 * "Corvette" from R-type Ⅱ stage 3 [video ]

=== The Arsenal ===
 * In the way


 * Recycler
 * "Bronco" from R-Type stage 7 [video ]

=== Space Mine ===
 * In the way
 * probably


 * The tunneling terrivor
 * "Outslay" from R-Type stage 2 [video ]

Miscellaneous

 * Paul's vehicle is called Arrowhead