The gem riddle is kinda flawed... technically, the answer 2 is correct, since if you take out 2 gems, they won't both be the same gem. They'll be "different gems."
My only complaint is that the HUD is very inefficient... you have to pause just to see all the kinds of ammo you have left. Still, it's so much fun. The gameplay reminds of of Soldat.
The music reminds of an old game I used to play called Yukon Trail, haha. Anyways, I'm really looking forward to version 2 when it's cleaned up. I love games like these. :)
I killed myself so often trying to jump or put down a block, but instead pushing the "change dimensions" key. That annoyed me to the point where I stopped playing... then I came back and beat it. Fun stuff. :)
I didn't have any of the lag problems people are complaining about... I thought the sound was excellent, but there weren't enough zombies to satisfy my bloodthirst. >:)
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