Lack of feedback from when i got hurt resulted in me not even realising that the things in the game were hurting me. It also feels like the invincibility after getting hurt is too short, resulting in me sometimes taking 2 or more points of damage when i run into enemies. Finally, the inability to shoot upwards meant that sometimes i would be stuck in up and down hallways with an enemy directly above me, and I would have to wait for them to randomly path into a side corridor before I could actually hit them lol. All in all, very well made, and very straight forward gameplay.