What do you think of Run-and-Gun? Thread

Anyone like Run-and-Gun? If you don't know what that means, it's basically games where you run...and shoot. Think Megaman and Contra. You move to the right and shoot enemies that get in the way, probably jump or dash to get to places to progress or get a better angle to shoot, maybe you get upgrades, you get it.

Specifically, what do you like about the genre? Or what would you like to see in a future R&G? Any mechanics in a specific one you like? Favorite upgrades or weapons? I ask this because I want a general opinion from the public so I can eventually create one that many people can like as oppose to what only I think is needed. I have some awesome ideas, and I've been experimenting and trying to learn the process of making a game, and have had some failures and revelations on the way.

This time I want to approach it with as many people in mind so I can get a general idea of what to do and NOT to do. So if you have an opinion, even a small one, share away!

Weapon variety and power-ups are a must have for games like this. It should be challenging but fair, and the control scheme has to be very fluid. Poor controls kill these games.

Power-ups, fast paced, lots of weapons, difficult, and variety of enemies are what make a good run-n-gun. (in my opinion)