Tiny War Of The Worlds by galman 2012-04-22T21:49:00
I quite like this, the idea is pretty simple but enjoyable too. Without the ability to upgrade it would have been a bit dull, but with upgrades and the points it gave a good motivator to keep playing.
Main issue I had with it was the way enemies spawn though - too often they would spawn in clumps or suddenly appear in front of you. I ended up going directly to the edge and moving along the sides, killing things as they appeared.
If this were polished up, maybe with some more strategy + depth (imagine allied planets which you need to protect or ships and trading etc.) I think it could make a really good standalone game.