The only problem with this game is that it is really hard, one can debate whether that is a good thing or not, sure, but I ended up getting frustrated after the first two difficulties and stopped playing. Apart from that it is a game with a cool concept I just wish you would make the textures look nicer. Sure you can say: "What's the point?", I think a lot of people would agree that having some textures following a theme is a nice thing that can only contribute to your game. As a side note, the full screen mode is blurry.
I know that it's hard but from what I've seen most people (me, internet strangers, friends) can generally get past level 10. I think that the "textures" (=graphics, it's not a 3D game) are very minimalist, which is a style I have adopted. I recognise the importance of graphics, but I will point to very successful games with minimalist graphics:
http://thelettervsixtim.es/ (not totally minimalist but still pretty minimalist)
Ultimately considering the fact that my last game took 29 days to make, I wouldn't be able to make the 30 day deadlines anymore.