Awesome, I'm glad you had a good time and thanks for the in-depth feedback! I agree with everything written here! As for the final boss, that's a really cool idea about giving the final boss all of your missing powers (but my head hurts at the idea of adding wall slide to an enemy...). I'm working on adding the missing bosses and final missing area (the generator core was meant to be bigger) for a post-voting release though. Oh, and the teleporters being accessible from the beginning is purposeful and I don't mind if you abuse the hell out of them, there are a lot of routes through the game and I'm still trying to find the fastest one. :D
I definitely agree on enemies shooting from off-screen, and on the camera stuff. I have a camera controller set up that can adjust its distance from the player based on velocity but it was one of the last things I worked on and I wasn't able to find a balance that didn't give me motion sickness before release. I'm still trying to get it working because not having blind jumps is pretty important to me, and I also wanna get that nice burst of momentum feel when the player dashes.
I'm super glad you were still able to complete the game, I've since fixed that bug (I think) but I'm also glad it's not 100% reproducible in the wild somehow. Anyway, thanks for taking the time to play my game!