Edit: I have made a patch for the demo! It fixes some of your concerns, such as glitches with Mewtwo, and tweaks a few other things, as well as adding the capability to grab while dashing.
To use it, replace the EXE of Demo 1.1 with the one you download. Windows will ask you if you want to replace the existing file with the same name, and you should say yes to replace.
Download here.
Here's a more specific list of changes:
Can now grab while dashing using the Grab key
Can now drop from ledges using Down
Fixed lagless ledge glitch and edge-cancelled Ftilt glitch
Fixed pressing away from ledge to climb up glitch
Fixed sound effect problem with Mewtwo
Can now shield-cancel Charge Shot and Shadow Ball
Fixed various sliding problems on landing aerials, including Mewtwo's Disable, Pikachu's Thunder Jolt, and others
Fixed Skull Bash's land-cancel problem
Most of Alfa's comments listed below have been addressed, FYI. I hope this helps everyone enjoy the game a little more.
For now, I think I am going to be making some new characters and stages, so bear with me, as I will be busy.
After stuffing around with Mewtwo for about 15 minutes I have a few things I'd like to say:
1. If you dtilt with him then continue to hold down then he won't stop dtilting until you let go. Pressing attack at the right time during this will cause you to Dsmash instead.
2. Landing during any of Mewtwo specials lets him slide along the ground, so for example, with his down B, he can slide at his walk speed as soon as he lands from the aerial version of it. Doing this with his forward B causes him to still jump like in the air.
3. (On FD) jumping backwards on to the stage with Mewtwo can cause him to drop into the stage up to his ankles.
4. Specials are cancelable with ledgegrabs.
5. You can't drop off the ledge by pressing down.
6. Pressing away from the ledge on the left side of FD is the same as pressing towards the stage on the left side of FD (but not on the right ledge).
7. Ledge get up can be cancled with anything at anytime, even walking of the ledge, which leads into a ledge grab again, and so on
8. Mewtwo's shadow ball charge stats off kind of off centre.
9. You're unable to hold Mewtow's shadow ball full charge as long as you want like in Melee.
10. Inputting a Ftilt on the ledge causes the sound effect to occur for no reason.
11. If you start charging a shadow ball and then fire it the entire charging sound effect occurs. Repeating this causes the effect to stack.
12. If you roll out of shadow ball charge by holding a direction you roll twice.
13. When rolling, inputting left or right will allow you to roll again, regardless of whether or not shield is held
14. You can't shield out of shadow ball charge, only roll.
15. You can't UpB downwards.
16. You can teleport through the stage (is it intended or not?)
17. You can't charge smashes.
18. Not really important, but if you die while holding a button, that button is ignored until it is let go of and pressed again (so for example, if you die while holding left, you won't be able to move left again until you let go of the button and press it again).
19. There is no way to exit the current match, like how in Brawl pressing L+R+A+Start on the pause screen lets you exit the match.
Overall, it's still a good game, just with quite a few kinks, but I guess that that is why it's still a demo.
Actually you may exit the match by pressing F3 during a match without pausing. You can see the controls by pressing F1.
Okay....
1. Dtilt thing is actually intentional. If you'll notice Ryu and Evil Ryu may also do this.
2. Down B and Side B sliding is actually a mistake.
3. Ah, I see. Still working on that.
4. Of course they are. You should be able to grab the ledge when you go near it. Unless using specific moves like Final Smashes.
5. No, but I was planning on adding that in.
6. Uhh, okay. I guess you're trying to say that you can climb up by pressing either direction?
7. That's weird.
8. Okay, I'll get out my magnifying glass.
9. Well, when I saw how much damage he was doing by holding it out, I thought it was fair. Eh.
10. Hm. Never experienced that before.
11. Darn it! I thought I fixed that! Maybe I forgot to save it?
12/13. The rolling multiple times thing I find hard to do most of the time. I actually never have seen this before I tried it a few minutes ago.
14. Shadow Ball needs help. I really must have been in a hurry.
15. That's sort of intentional.
16. It is, but it leads to problems and I need to find a way to let you do it only in certain places.
18. To be completely honest, I don't care about the button-holding death thing. It does that because the character gets reinitialized when they die.
19. Like I said use F3 during the match to declare No Contest.