Temporary Space for PS Vita

Simple homebrew shooty game based on asteroids - this version is actually an expanded version of the game as it currently stands on VitaDB featuring more space, more planets, more shooting and even a boss! Play is standard asteroids fare - turn, thrust and shoot (and stay alive!) This version is essentially the first sector and is (just about) ready for playtesting - there are still a few rough edges, but hopefully no bugs - so now I am looking for feedback to see if anything needs balancing, and more importantly how it plays! :D If you have any feedback at all, please let me know!