It's WAY too hard and has a few problems.
The only way to actually beat this game is to memorize where the sticks pop up so you can shoot them. The part in the end, there are so many people that shooting at the same time, you NEED to have a near perfect game before hand to survive because you WILL lose like 1/2 your life bar there. There are quit a few serious flaws that add to the difficulty.
1. You CAN'T shoot someone if they are moving. You MUST wait until they stand still to shoot them. For a game where time between shooting or getting shot is so limited, you should make it so they can get shot while moving.
2. At times, for whatever reason, the gun just doesn't shoot when you click, even when I didn't reload.
3. The only way to know when it is safe to reload is to memorize the game. This is quite unfair.
4. Sometimes I choot someone, and they don't get shot.
There are a few things you could do to make this game better. Difficulty levels, more time between a person's appearance and when they shoot, more heath replenishing spots, checkpoints, or fix some of those flaws I mentioned above.