The shooting was way too difficult.
For these types of games it’s always a good idea to give the player a visual indicator of where they’re shooting like a laser sight. The bullets moved to slow and the enemies moved too fast which made it nearly impossible to aim. Their aim was nearly perfect so the only way to win was with the deadshot skill which made the rest of the shooting feel kinda pointless.
This is a good start for a game, but it needs some tweaks to the gameplay to be an enjoyable experience