Honestly, the controls made it no-deal for me - I kept sliding away off-screen and it was generally just too hard to control. Maybe that's me coming from a classic bullet hell games standpoint so muscle memory makes it harder.
Maybe designing it less like a traditional bullet hell and more around the sliding physics... I have no idea how this would look like (and the controls may need to be changed to tank-style maybe), but it feels there's something to explore here.
The idea itself is a lot of fun though! I keep coming to this game and how the sliding can be played around with in my mind.
In my opinion, with a bit more work this could be a cool game! Thanks!