What you’ve come up with there is exactly the same as Pipe Mania on the zx spectrum 48k and a million other games before you thought of it. Its near impossible to come up with an original game idea that someone hasnt already done in some way.
You just have to do it better than anyone else. Theres nothing stopping you from making that game, do a mobile app and sell it on the android/apple stores.
Blitz cant exactly sue you for making it, its just a puzzle game, theres no copyright on genre. If there was, Wolfenstein would be the only first person shoooter game ever made.
The amount of time you’ve spent wallowing in self pity and blogging about it you could have made that simple game and stuck two fingers up at Blitz. Use the experience as motivation to succeed rather than…whatever this attention seeking nonsense is.