I just beat Skwish and had a great time. I would say a completion time of two hours is accurate, but it's pretty concentrated fun and it unlocks the score mode. I REALLY wish there were perfect or par scores for each of the levels though. I think that would've given it a ton more replayability and I'd definitely play another few hours. (I also really just wanted to fill up 40 stars or check-marks or whatever).
I love the music! I turned off my podcast to listen to it while playing. The menu music is great too. I wish it cycled between the songs, because I was rarely at the menu and never for longer than five seconds. I'm chilling at the menu to listen to the music right now. The animation successfully makes everything good and squishy. It looks great in motion and the overall presentation is polished. There's a bit of lag when spamming undo with large blob formations, but it doesn't get in the way.
The first levels tutorialize the basics seamlessly. It was paced very well. Levels are mostly simple, but smart. Finally, this is the first sideloaded game I've seen that has custom wrapping paper!! All the little stuff on a solid puzzle base makes for a charming game. I think the demo is easily worth your time. Thanks for reading!