I've beaten the game.... its hard because the controls are really bad especially when he jumps.... he goes in like the wrong direction doing a backfit for like 50 feet. but somehow i managed to get it down.
You can save the game... If i remember correctly when it ask you where u want to go next, press select and "save game" will appear... go to it and ur all set.
I never used the bombs will in the tunnels because I think all you can do with them is place them on the ground in front of you... I think they can kill you and they slow you down and before you know it, an ant is eating you. They just dont serve a great purpose so you have to be conservative/a good shot with ur pistol. To use the bombs press button one and down at the same time, but i dont know if you want to
Its a fun game besides having some of the worst controls ever