If you have problems after installation, try to install OpenAL. (http://www.openal.org/creative-installers/ -> oalinst.zip)
For sources, I've used Visual Studio Community 2013, and the last MonoGame release.(OpenGL template)
Enjoye !

Nice and fun action-packed game!
The cow-launcher is incredibly funnny, and an efficient way to fight pollution! :)

Congratulations!

Good peace to the game. I really like the cow weapon.

Funny and well playable but very repetitive (gameplay and music).

I also prefered the cow launcher. It seems a popular choice amongst commenters.. Then again, i guess the flower is a classic. The music was a bit repetitive. I liked the environmental angle :3

Innovative and in-keeping with the theme. It does get repetitive after a while but the cow launcher is good fun.

Flowers? Cows? Carrots? How can you not love this game? I just can't get over how fun it was to defeat cars and planes with cows :) Well done!

I dont like installers...

This game shows a lot of promise, and I had fun playing it, but I feel like you missed the mark on a couple of areas.

Pros:
-Once I understood the controls, the game was pretty fun to play!
-The music was pretty good, and good on you for making it! That's a big challenge for a lot of people.
-Your graphics are fun and whimsical, and you can definitely feel a unified theme here.
-I LOVED the cloud cover as a visual indicator of success and failure. GREAT execution there.

Cons:
-Your title screen lists strange keys for directions, but when I played it, it was WASD gameplay.
-I don't feel like the game got harder as time went on, and there was no win condition. If a game does not progress in difficulty or list a win condition, it quickly becomes repetitive.
-I wasn't immediately sure what exactly my enemies were. This game could use an instruction screen.

Over all, I think you have a really solid entry here. It was really fun to see your game in action! Thanks for sharing it with us. :)

Also, on a side note that did not figure in to my scoring, consider switching to a game engine that does not require installs, such as Construct 2 or GameMaker: Studio. The added benefit is that you'll be able to deploy to more platforms as well.

Thank you for your feedback!
I realized too late that I did not put the right direction !(too tired...)
I take your point about "installer" : Bad idea !

Grats on your first LD entry!

The game is pretty well done for your first time! Ares of improvement:

- The music was a bit too repetitive. No one like a 5-second music loop.

- your audio balance was a bit out of whack. music overpowered all other sound effect.

- the framerate/speed of the jump is jarring. it's hard to hit the planes and bags because of it. slow it down and/or increase the framerate to help with this.

- The cow launcher is fun, if not a bit OP.

Good game overall, and keep at it!

cool! Big fan of the Lo-Fi style, but i'm kinda missing that audiosample by SNAP 'I've got the flower!' :D

Please don't use an installer, just have an exe.

Some others have already mentioned the installer issue, I found the concept very interesting, fighting against the pollution, but it quickly became tedious. There was a lot of graphics involved, so I'm guessing this took a lot of your time, it may have been interesting to add things the player should not shoot, and or things to avoid touching.