You can definitely feel the games age a bit. If your rocket gets too big without the right support, it begins to flop around like a fish out if water. Fast forwarding time also messes with larger rockets and can ruin your launch. The graphics are also what youd expect from a game that old
Still, i think its a great game. There is a lot to do ingame. You can build your own rockets, probes, and rovers. You can lanch to orbit planets or land on other planets. I think you can even establish bases on other plants. You can also create planes for exploring "earth". Once you get bored of that, there are mods that can give you a whole new experience.