I swear bullet hells don't like me...
I suck at these type of games, but I really liked the concept, although getting killed because an enemy will be standing right where you are in 10 seconds when you go to the future is pretty annoying (maybe adding a little invicibility just when you check out the future would be a good idea ? Just a thought...)
I also think having the enemy visually react to your hits would have been nice, but at this point I'm just nitpicking.
Anyways, good concept and good game !