That's epic!

It seems like you are going for a cartooney, bright, and relatively simple texture pack. In my opinion, pulling off a simple texture pack is hard. Too bright a color scheme can be unappealing, I'd say this is a little noticeable in your ores. The ores themselves, in my opinion, take up a little too much space on the block, since you're going simplistic, and won't be using much shading, I'd say reduce the size of the ore, let it complement the gray and not be overpowering.

For some reason, even though the rungs on your ladder aren't even, it seems to fit your texture pack, I like it. It gives your texture pack something that does set it apart, even if just a little.

I say a relatively good start, but be sure to get balancing colors correctly, making a pack to look good without shading is a difficult feat. Good Luck. :)

Nice work!