Sounds ripped from Bionic Commando, Ninja Gaiden, Contra, Solar Jetman, Blaster Master,
Super Spy Hunter, River City Ransom, Castlevania, Castlevania 2, Bayou Billy, Wrecking Crew
Super Mario Bros 3, Mega Man 5&6, Power Blade 2, Gyruss, the Guardian Legend and Street Fighter 2010

Arti's hands are paintovers of a few Doomguy hands, including Eriance ones (Sorry I don't have more accurate credits here)
While most of the weapons were drawn by me, I also had a lot of help from HyperUltra64 and Skelegant for touchups
Thanks to Captain J and KishinCookies for advice and assistance with perspective crap for the player sprites and HUD face

Pickup sprites were provided by skelegant along with a few rips from Contra and Wrecking crew.