Hey,
The concept of the game is quite nice and it is fun to play, but there are a few things you need to polish up to make this game super interesting and professional.
Some quick tips are,
- Make the movement mechanics more strong and dynamic, currently, the player seems to float around and the feel is not that great.
- Next, your button mapping for the players is not that great as it's very hard to use.
- Make sure you use some obstacles to defend both the players.
- Level design can be more enhanced ahead of time.
- Graphics, especially the level graphics can be made more appealing.
- Shooting mechanics can be made more dynamic and awesome.