I played the abandonware version of it like 5 years ago, and it had the same appeal to me as it did when I was just a kid. It's a game a played a lot. It has 3 completely different worlds (Space, Surface, Underwater) with unique enemies and a shop that's not necessarily "buy the most expensive item and you're set" mentality. I like that. Been hoping for this game to appear here for a long time, and now it did, and it's even free. Get it, play it.