Really good idea but then again i love games like this, better graphics and less glitches and better controls, also improved gameplay, not just a swarm of enemy's, like a storyline and ease you into more and deadlier enemy's. your defiantly onto something tho (Maybe an upgrade system for your ship? ;D )
First time making a game? if so well done ^.^
Unfortunatly you have alot more practice to do. this type of game has been done alot so you need something that makes it stand out, also the graphics need to be greatly greatly improved.