A crash does not cause it to delete the game because there is no game save for it to delete is the problem. Right up until you save a quit there is nothing keeping a record of your game progress. An autosave feature would simple ensure that if your game crashed you could keep playing but if you died...

From what I gather you have to be cloaked when the fight ends so upgrading cloak is essential. When I got it I found that I only unlocked the achievement once the enemy ship had fully exploded and I was still cloaked otherwise it does not seem to count.

I like the suggestions. I in particular though that there SHOULD be a boss at the end of each sector. Not just for the above reason but to add more variety to the challenges you have to overcome.

Surprised this has not been fixed yet.