Hey, this has probably already been answered, so I'm sorry in advance for this, but:

The control setup doesn't let me use the "Ctrl" key at all. Is that on purpose or is that a current limitation?
And can it ever be enabled?

Also just a thing that has been bothering me from previous demos:
Whenever a character is sent flying, I just don't... "feel it", if you know what I mean. Sure, they go flying very fast, but there's something there that just doesn't give the same feel as the official games, I really don't know how to explain it. Might it be no hit sfx when it happens, or lack of enough screen shaking? On earlier demos, I also felt like the stages' blast boxes/zones were too... big? Like, the character who was sent flying took its time to get there and actually die, so that coupled with the other thing sure didn't feel quite right. Since the scaling thing has already been fixed, I feel like that could be the next step.

Anyway, sorry if I sounded harsh or demanding. I really love this game and have been following its progress since I played v0.6 in my school's browser. Thanks in advance!

The Ctrl is used for short-cut for programs and other functions. Pressing the Ctrl-key with another key will activate those functions, so it can't be use for the game to avoid things like accidently changing the window size or closing the game. Just use another key.