Alpha Prime is torture to play through, enemies take too many shots to kill, the main weapon to use has a 28 round mag and it seems to require about half of it to kill one enemy. Helpfully the enemies always follow the same path around an area to shoot you though. Also, instantaneous reactions makes entering a room pretty challenging. Has the base of a good game though.
I do like how they have the Arma 2 soundtrack in the game, too.