I am a creating this third person shooter game that will be multiplayer and the goal is to hold the longest kill streak. But I need help on whether I should make it mobile or webpage or computer?
Nobody else can tell you what you game vision should be. There are advantages and disadvantages of each platform you listed. For a multiplayer shooter style game, I cannot imagine mobile working too well, but you might have a totally different vision in mind. Maybe what you have in mind would work for mobile.
My best advice would be to build a prototype of your game for the PC. Test it initially on the PC. Then test it on the other platforms that you are interested in, such as mobile and/or webpage.
Thank you.
For deployment web games are far more tolerant of casual junky stuff. On PC and console you’ve got to compete with the latest AAA games in this space.
Mobile does casual well. But you have very limited input available.
So my vote would be a web platform.