(I am now in a rush to test as many games as possible to help, so please do not mind the cursory reviewing style.)

Semi-on-the-fly remarks:

REMARK: first game I test from the special page for submissions with few votes! (The previous one, "Punk", was not easy to download and had a suspiciously early publish date.) I usually use it, but went for Karma, this time. TIP: review other people’s games to spark interest! Including getting higher on the Karma ordering, which depends both on your comments/ratings given and on the ratings you received. ;)

1. Controls are QWERTY-only instead of layout-independent (I have an AZERTY keyboard), BUT arrow keys are enabled.
2. fast movement
3. shadow: so, we are some kind of giant pill? ;)
4. Oh, knocking some things down, I notice the spheres become ellipsoids when rotating! :o Is this on purpose? Like, a non-Euclidian world? X)
5. Feels like a playset with things and persons to make fall! X)
6. Jimmy Neutron?? Feels a bit out of place! Or I did not get something, or you planned some specific story.
7. Ah, you can jump with Space! And crouch with Left Control. You should mention all controls on the game page, I think.

Takeaway: I agree with Delldone9831 that the game seems unfinished. I agree with his wise comment. One thing I can somewhat judge is your take on the theme: choosing zombies falls into the category of those games that chose a ‘horror’/supernatural element, so this is quite classic, but fair.

Keep on enchancing your idea, footstep by footstep. :) A French developer teaching video game development (David Mekersa) calls looking at the big picture without seeing that you can take on small steps the ‘mountain complex’; not sure if the term is idiomatic in English, but you get the idea. ;)

It feels a little bit unfinished at the current state. You could expand on the concept to make something similar to blast corps. Maybe mix it with some bulletstorm abilities. With a score counter, sound fx and a explosion effect. A Tip for the graphics: Use more desaturated colors. And dont use AddForce for the movement if you dont want the player to get faster and faster. You could use velocity = ? . Keep up working on it! 

(Maybe you feel like you could never compete with the other developers. But thats not true. if you keep practising you will get better and better)