The way the chara just has this stoic attitude and his face, while the bullets go slow and then speed up, its just feels badass. Especially when you set up a stack of stuff and then clear the room at once. That just feels so satisfying. But the times when it is like this, then this, then this, was not as cool as criss cross all of this at once. Like where you have a sequence of turrets up higher and higher vertically and it is like climbing a ladder, feels lame.
But like a room where you can basically see everything but theres targets at different positions and timing and you set it up and then clear em simultaneous, yeah that's the shit right there, focus the level design on that for real. Also if it can be setting things on fire and then stuff blows and and burns like those green pipes in the background could burst and spew burning flames when "room cleared" that'd be sweet you should totally do that it'd be awesome.