FDG Entertainment will be helping the developer to bring the game over to PC and later on we will see ports of the game on other platforms.
Ports for PS3,PS4,PS Vita,XBOXOne,3DS and Wii U were mentioned on the Kickstarter and one of the first stretch goals was the Vita port which maybe hints that the game will be first ported to Vita.
As for the prequel, the sequel won't be a shoot'em up game but it will be a Action-Adventure Game with platforming and RPG elements. It will be in 1080p and 60 fps.
If you are interested in the prequel you can check it out on the PSP,PS Vita,PS3,Iphone and Ipad.
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