Rémilia's controls are amazing (besides how you have to stop whenever she lands).
But there are a couple of things that don't feel as good and hurts the game.
There's the explosion effects on Rémilia's attacks, they're pretty good at camouflaging enemy bullets. Goes without saying, the explosions are of the same colour as the bullets, and they're really bright too.
The lack of checkpoint. I got to the boss (that's stage 6) but damn it's hard in a stupid way, I replayed the game 4 times up to the boss only to get cornered in 1 second (because there actually little space to dodge, and I have to be on HER platform if I want to hit her) and get sent back to the title screen.
So yeah, the "feels good" are held back.