Worked some more on the game today, spent some time pro­gram­ming the enemy bul­lets so I can change their direc­tion etc at will. Also added some ene­mies with no AI and place­holder sprite just to try out the bul­let code. Spent some time tweak­ing the hit boxes as well.

You can try the lat­est ver­sion here (con­trols are the same)

Edit:

Upped the res­o­lu­tion the bit (about twice as high), new HD ver­sion here