Hmm... Not bad, but I do see a few issues. First off, the coins seem to be absolutely useless. They do not increase Distance or Speed that I can tell, the only two measured statistics. Secondly, the Yetis are a bit of a problem. These massive obstacles appear without warning, and move back and forth in your path. Perhaps a "Yeti Warning" sign? Finally, and this is more of a polish thing than anything, an ending, or even some acknowledgement of progress would be nice. I am currently at more than 500 distance, and things are identical to 0 distance. Thank you for your time, and all-in-all, a nice little game. 4/5.
Congratulations. You just tried to overwork your cashcow, but she died in the process. You killed a swathe of your fanbase with this last update, and ruined balance to boot. Let this stand as a lesson to other pay-to-win MMOs, don't let greed cloud your vision.
I just had the weirdest bug. I was on Wave 23, when everything froze in place on my screen, including the wave timer, except for me and two zombies. For some reason, all the stuff that froze was frozen in place relative to my character. When I jumped, it moved up. When I walked over to get the engin, they slid left as well. For fun I tried picking of all of the "meat" from their skeletons, and, as soon as I finished, everything "resumed", including a flood of money and exp.