Soooo, unfortunately I wasn't able to get my score to the Leaderboard although I killed the boss
At some point the enemies start spawning veeeery rapidly and FPS drops to 0 few moments after it happens (about 1-2 minutes of play)
Sometimes when unlucky the ammo doesn't spawn and the only thing left is death :P
After hitting the Boss once his HP Bar shows he has no more HP
And although killing the boss the game didn't end (maybe that is supposed to happen)
Otherwise it's a very fun game :)
Gameplay - 4/5 (due to the small gameplay related bugs) but it's a fun game :)
Theme - 3/5 because there was no mutation functionality, just mutants trying to kill you in a lab :)
Aesthetics - 5/5 - I love how it looks like, very nice graphics! Smooth and retro
Sound - 4/5 - because you could add some more sounds + options for audio