Kamikaze Attack is the most simplistic serious sam game ever, recently I decided to play all the available SS games on steam and picked up most of them.

Gameplay
A simplistic platform scroller with the main objective of blowing up the man himself, serious sam. Though it was a bit addicting and frustrating but you can do a 100% in one playthrough, watching out for rockets and avoiding bombs is all to the gameplay, you have also some kind of a jungle dlc so you can have the first encounter in egypt and serious sam 2 in the jungle themed one. You can also customize your kamikaze and abusing the hell out of the meter while jumping in the air.

Conclusion
Very simple, not unique in any point but alright if you want to play all the games out of boredom.