Army Moves

Have had this music pop into my brain every now and then for some time now, even though I've not played it in years , so thought it was time to play it.

I only remember level one and thought that was gonna be all. Guess I've never played through it before, because it had several more levels to my surprise.

Level 1 ("section", but prefer "level" is pretty straight forward. Level 2 was much harder as the hit-boxes are crazy wrong. Died so many times on level 2, same on 3 and 4. On level 5 tho I wondered what purpose my gun has as it doesn't seem to hit or kill anything (same with the grenades), but what the firing does is make the birds fly upwards, so I can go below them. Messed up hit-boxes here as well (especially the enemy grenades when they explode). Then the rest ones were just run and shoot, ez. Could only go through the doors after they were opened (probably by the enemies).