Glass is awesome, so I had to check this out even though I've never tried glassblowing and don't have the first clue how it works. I love the illustrations and the calm repetition of figuring out how to do glassblowing, getting into the rhythm of it, learning when to hit vs. tap with your different tools and so on. It captures the arc of learning to do something, struggling with your failures but moving on anyway. Even after I figured out how to do things I still got a spike of worry whenever I clicked the link to proceed on the off chance that it wouldn't work anyway, and then it would go through alright, and I would breathe a little sigh of relief.
Overall, the game reminds me of a pottery-making app I was briefly obsessed with as a kid, where they simulated a potter's wheel and you could use your fingers to shape the digital clay pot and afterwards glaze and color it and everything. I spent hours on that app making all kinds of nonexistent clay pots. I would play this if it was a 15 hour game where you just make different kinds of glassware over and over again
TLDR: Glass is awesome. It's shiny and smooth and so cool to touch and when the light goes through it gets EVEN SHINIER. Once I visited a glass museum and they did a glassblowing demonstration and it was epic.