I didn't really like the controls, but I liked the art and the concept. I feel like the enemies and waves have a big impact on the gameplay, what is nice.
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In my opinion, the game's controls would be better if aiming and certain commands were mouse-based—though not necessarily all of them. It was very difficult to aim precisely at enemies because the aiming was too rigid, locked to 90-degree angles; furthermore, it was sometimes hard to tell what was happening in the game and why I was taking damage.