Thanks a lot, I'm glad you enjoy the game.
It will continue being updated for as long as it can run on Windows, there is no set date for the end of updates.
Updates will include various improvements to gore, gameplay, some new weapons, enemies and levels, I'm currently busy with other projects so it might take time to see more updates on Final Response but they will appear at some point. I think the game can automatically update if you have the itch.io app, but otherwise I'm afraid you will have to download new versions here manually.