Well lets get direct to the point i love this style of games the called - Upgrade shooter games - really love these things and my score for you is:
- The History or anything related to that is a complete mistery 2/10
- The Action is very nice killing a lot of enemies all the time with the upgraded weapons are fun 10/10
- The upgrade system is easy and simple,works very well no problems here 10/10
- The game could be more longer ,but its good enough at this time 8/10
- To me you deserve 5 stars because its was a really nice game and expecting you to do more games that in the future,good luck .