Probably not all that many of our VGC members, because it was kinda expected to be bargain bin material. But those of you who did buy it, what do you think of it? Do you regret buying it?

It's an okay game that lacks in some areas like controls, level design, collision detection, multiplayer and rewards.

If you didn't buy it yet, I would advise you to wait until it drops in price, because it's not going to take long until then (if it hasn't dropped already). That's the fate of artsy games. As for your questions:

Its best quality is probably that it isn't a Nintendo game. So if you despise Nintendo, there is a better chance that you will like this game. I honestly can't think of anything that this game does really well, but it isn't terrible either. It just feels average for the most part.

I haven't played the demo, so I can only take a guess that it is a good representation of the first half of the game where the problems aren't as severe. Things can get really hectic in the latter half of the game and annoying when your character pulls off a move you didn't want him to. There's a lot of frustration involved and the plentiful checkpoints and infinite lives serve only as a band-aid for this problem.

The problem with multiplayer is in the level design. By default, you need to forget about 20 % of the levels in this game, because they really are for a single player only. In the remaining levels you need to accept that you most likely won't be able to get everything, because quite a lot of stuff is timebased and the more players there are, the less likely it is that everyone moves at the same pace in those sections.

The main goal of the game is to collect Electoons. Half of them are hidden in the levels, the other half is gathered by collecting a certain number of Lums (these can be timebased) or by doing speedruns. I am not sure on the required numbers of Electoons you need to reach by certain points of the game in order to play the next level, but I think it's possible that in multiplayer you need to go back to previous levels or play some singleplayer.