Nice game, there's a lot of content here for only a month. Having those options and the shop between boss is a great feature. I wish we could restart a battle instead of the game ending when we die, it's quite a hard game so restarting is harsh. 

Also it might be only me but the background of the page around the web player has the same patterns as the game so it was confusing to tell the two apart while being shot at. 

Very good entry overall !

gets pretty tough pretty easily! good thing you have an upgrade system in place :)

Music is a unusual match with the genre. It seems like you die with one boss hit. Interesting concept. Cool that there are tank options and upgrade options.