Interesting concept. I think it needs to flow a little faster and perhaps have a slightly different random piece allocation (or it is just me being bad I dunno).
I got stuck on the single player level and tried to restart, but that just led me to a black screen. I had to quit the game to try again.
The danger music is pretty cool!
I tried the local multiplayer. I feel the spaceships need to have less HP, and it is lacking music as well.
Overall, I found it to be a pretty cool concept, but it needs polish