First try with proper controls 74,100.
Game is a bit annoying that when you die the character walks right up into the screen leaving you completely open to another quick death. So for me I got near to 74,100 with the first life and then without a tank or powerups I got totally destroyed. Getting out of the tank is also much slower than it needs to be. Strategy then is to hop from tank to tank.
I didn't try to use any analog controls. I assume this is for tank.
Still I quite liked this on C64 as is similar to Commando. I think there was also another C64 game similar which I played extensively but I forget the title, or maybe I've got that mixed up. Edit: It was likely Who Dares Wins 1 or 2.