This game is incredible, and I'm not going to give it a negative review simply because ruffle doesn't emulate it well. I love the progression and gameplay of Into Space 2. The art style is perfect, and the side missions are engaging. The soundtrack is also great. It's an excellent sequel and an amazing game overall.
As for ruffle, this game did not run well in-browser for me. The menus work perfectly, but as soon as any gameplay starts, the game gets very laggy. And by lag, I mean that the entire game slows down. The rocket moves slowly and there are severe audio glitches. Can you play this? Theoretically yes, realistically no. Install Flashpoint instead.