I played for about an hour a half last night, all with the Twin Sticks. Overall, it's really good. The action is quick, the sound both music and voice is excellent and there's a good challenge here.
I do have some gripes, though.
First, while the music is great, there isn't much of it and the loops are short. I feel your hit box is too big. There's clear daylight between me and an enemy or bullet and I'll take a hit. Speaking of the bullets, it would be nice if the enemy's bullets were a different color than your character's bullets. The bullets can get lost easily. The Twin Stick works great, but it would've been nice if they had the controls listed in the manual. You can pick them up right away, but since the buttons on it aren't labeled, it's still a guessing game at first. Also, if you try to roll when against the wall, even if you are ever so slightly pushing in the direction of the wall, you won't roll at all. There's also no indication of any point when the game is loading, and no option to load/save a game (not something I typically use when there's auto-save, but most games still have the option).
But my biggest gripe is with how high scores are handled. It's nice to have the high score and current score on screen as you play, but the lack of any sort of leaderboard almost defeats the purpose of the game, which is to go for high scores. That, and both difficulties go towards the same high score. So I set my high score on Easy, but since I haven't beaten that score when playing on Hard yet, I have no idea what my best score on Hard is unless I write it down somewhere. It's a curious omission.