1. Make enemies move. It’s shooting game, so there should be a challenge about shooting/aiming. Don’t just increase hp and dps of enemies.

2. Some enemies should have constantly low maximum hp no matter what difficulty is. It’s frustrating that all enemies have a massive amount of hp. There should be a small windpipe that makes players feel relieved.

3. Improve AI bots and make the game a single player after a month the game has been released. It’s a miracle if you meet someone after waiting 2 minutes. And also we don’t need to wait for 2 minutes meaninglessely.

4. All heroes mode!

Any more suggestions?