The weapons are unbalanced. Apart from that, interesting idea.

Great idea, well done!
It took me a while to figure out the acutal mechanics, but I had fun doing so!
Haven't been able to beat the game yet...

The backgrounds are somewhat disturbing :P.

Congrats on finishing the game!

Interesting idea, I found the weapon-swap timer to be a bit frustrating, especially when I accidentally reset it, or it game me a rubbish weapon (eg the shotgun).

Some nice ideas in there though, and the basic moving and shooting felt very solid. Good work.

Cool game! a little bit too hard, though

Slightly unbalanced, but otherwise a nice game.

Nice background switching :D

the game was fun but it was a little unbalanced and i didnt really know what i was doing half the time

Very Hard! I had fun, and I really liked the theme. Not the LD theme, but the computer theme.

Nifty idea! A bit unintuitive, but fun. Great work!

Cool game, loved the backgrounds

Check this one:
http://ludumdare.com/compo/ludum-dare-31/?action=preview&uid=44716

How do I run a .love file?

On linux install love2d, on mac no idea, on windows just download the exe file

Nice game! OMG the backgrounds! XD

Very nice game, great potential.

the boss doesnt die!

Don't rush it, like said in instructions his life go down with time you spend on others levels. (and surely when you shoot at him)

Really difficult to understand without instructions, had to go back here and re-read your description, but after that it all made sense. And I was able to enjoy it.
It get's really easy when you just try to re-roll the same weapon until it just gets incredibly strong. (The automatic weapons are still the most powerful). I would suggest making the weapon timer shorter, because it's really punishing having a really weak weapon for 20 seconds.
Eventually I was able to beat it.

Solid top down shooter! The sounds are a little bit annoying and need to be tuned, but that is a minor complaint given the amount of time. Other than that: Well done!

Awesome graphics! I can't dig why I've fight against the flys but anyway it was fun!

The weapons were a bit weird and the combat mechanics were hard to understand, but over all a pretty decent piece of work.

the weapons are a bit confusing. greetings from another löver ;)

Interesting! The boss came to soon, when you are getting the hand of the game, it appears, and then the whole dynamic changes!

Would delay the boss just a little bit!

Great job! I really enjoyed this entry! Also, included this game in my random LD31 gameplay video :D https://www.youtube.com/watch?v=Ei_gJeG5cgM

Nice game. I saw the theme to fit very well. It was a lot of fun to play! A little loud maybe. Some of the weapons felt too weak (shotgon).
Great game overall =)

I think u should work on your weapon balance.

nice work