Easy after a while
Once you get all ur power ups, and the laser pistol, easy as pie, you get like 80000 EXP to spend. I went and got the 1st revolver, then the 2nd assault gun, then leveled everything and got the LP, and then after 1 round of it able to buy everything and have enough to get my health up to 1000, and base up to 3000. Just continue using the LP and u got pretty much infinity EXP which means infinity Base and Health. Got boring after that though. Sound really repetitive, and what I didnt like is no corpse removal, I could barely see some enemies cause they blended in with the blood. Graphics pretty standarad, style I liked the defense. Violence, lots and lots of blood.