Can't remember this old game i miss... This is the only image I have found on the game from my searching which I found in google images by searching "flash game hybrid".
Echoes Operation Stranglehold Act 1 Boss - YouTube
A Flash Game Dev Story — “Echoes: Operation Stranglehold” | by Ido | Medium
Echoes - Operation Stranglehold - gry Jeja.pl
A Flash Game Dev Story — “Echoes: Operation Stranglehold” | by Ido | Medium
Echoes - Operation Stranglehold - Play on Armor Games
Echoes - Operation Stranglehold | Kano Games
Echoes: Operation Stranglehold - Kids World Of Games - Dailymotion Video