Look at these I decided that I was going for a sci-fi based action game, with the main weapon being a normal weapon and letters scattered around the level to give you access to a super weapon that is a futuristic melee weapon.
The character may also have a companion, but that would be late development if I decide to do that.
The enemies and character could interact with the environment.
Enemies could have little faces or unusual animations to make them look more alien or robotic like.
Bonus levels could be a thing and was thinking of a retro style look, which could be used to obtain power-ups, health or extra lives.
Putting assets in the background would increase depth and could be useful to show I’m in space or something.