1.) I think the dash feels pretty good. I wasn't sure how long the iframes were on the dash, but it felt like I could dodge through an incoming attack and not take damage.
2.) I think the enemies felt good. I died on the level with the two jumping enemies, and I think I could get through that with some practice. I'm not sure I could get through three at the moment though!
3.) I feel like the game is pretty well balanced. My main suggestions would be for things outside of balancing. You guys say you're working on animations under your planned features which I think is good, since I feel like the more frames of animation you have the clearer your attacks and movement will be to the player. I also got confused going through doors at some points since the background looks similar, so I'd look into making it more clear to the player that transition happened. Overall, however, I think the game looks quite good!