This game was exported in Flash and, as you probably know, Flash has been discontinued.
If you happen to have an ancient computer that still runs Flash in the browser, or a copy of the Adobe Flash Standalone Player, you should be able to run the original game.
There is a somewhat-working HTML5 export of the game as well, which you can have a go with.
Lo-Fi Dick Fight was written in Haxe, using the HaxeFlixel library. Sound effects were made in bfxr and the font is SquareFont by Bou Fonts.
You can read my writing about Lo-Fi Dick Fight on my blog. Lo-Fi Dick Fight has been featured on IndieGames.com, Superlevel, Kill Screen, PC Gamer, Free Indie Games, Forest Ambassador, and in a YouTube review by SourceFedNERD.