Simple straight forward premise, good sound design and quite nice 3D art!
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Fixing the nav mesh certainly makes the game more engaging, the way the little aliens jump out from behind objects and from the pits is quite charming. I liked how the enemies would force me to walk backwards towards the pits while i was firing at groups of them, it added a little bit more tension to it. Upon replay other than the game not being completable (which you guys are already aware of) the only thing i would say is that falling into the pits should trigger player death as I fell into one and had to reset.