Really nice pixel art, and Wally is a charming guide. I liked that he explains the stations as you go instead of hitting you with a wall of text at the start. The concept is fun, and after the first failed launch I immediately wanted to try again and see how far the next rocket would get.
The minigames are enjoyable. My only worry is long-term: after many runs, mining, casting and tempering could start to feel like something you have to get through before the next launch rather than something you look forward to. They never got annoying for me, but some variation over time could help, like new challenges or shortcuts once you’ve mastered a station.
I’d also take a look at the balancing. At one point I just threw some random metals together without thinking and still got surprisingly far. That’s great as a reward early on, because it gives you a quick win and makes you want to keep playing. Later, though, it should only rarely work, so that experimenting with formulas and tempering actually pays off.
Overall I had a great time with it and I’m curious where it goes from here. Good luck, Wally!