I'm glad you're still enjoying the game this far after release!:) Haha I gotta say, that would of course make the game more interesting, but also would be a tremendous amount of work for me, and to be blunt, isn't gonna happen. I do have... something related to level/world progression planned for a future update, not quite as complex as what you're describing, but I think it'll be interesting all the same!
ooooooooooooooooooo [more audible excitement noises]
also while on the topic of future content, I just have a couple little suggestions for new items
weapons: one that bounces off walls/enemies (but is just a single moderate-size shot), or one that splits into two shots going left and right when it hits an enemy
items: one that makes blocking easier, and one a la mirror ammo that makes blocking recover health (at half the rate ammo would be recovered normally) INSTEAD of ammo