@oareaso: haha yes it is, Super Methane Bros, as soon as i saw the name i was like, yup thats it!

Was fun playing it... haha Thanks alot!!

I used to play this game on windows PC, in the early 2000s

The game was a 2d type Game

it had different levels to pass

-You had a gun by which you would capture the enemy creep in the gun and shoot it towards another enemy and it would die, kill them all and go to the next level

it was a downloadable game from google.

any ideas?