YAY finally beat 58, i used BFG Lightning and Short Shield, just stay in the lower corners and use short shield when they speed after you, and the BFG when they start to gather around you
i liked lvl 20, but i died after i won lol, it sucked, good game tho 4/5 i just wish u cud upgrade ur ship, like more health or regenerate health, andit wud be better you could upgrade the weapons, that wud be good