Had a lot of fun with it! The timing with the vortex mechanic took me some attempts to understand but it was very fun to play with once I got it.
I think the collision box of the player is a little punishing. Sometimes bullets hit me when they seem like they souldn't, and going through doors isn't very smooth. There are also some cases where bullets are stuck in place, and when I restart they sometimes appear in the first room where there are no enemies.
Overall a very nice game!