Is your original post up-to-date with your current supported archetypes? Makes it a lot easier to switch from looking at the cube and looking back to this thread at what you want to accomplish with it.
My first pass of the cube has me questioning the sort of density you're building at certain spots. For example, there are 5 creatures in the 5-drop slot for white, and 4 5-drop white creatures that support a "tokens" strategy in some way. Though each one is pursuing a different goal, having so many at such a high point in the curve will lead to the weakest of them (in this case, Sensor Splicer) typically going underplayed, or may lead to midrange slugfests where the early game simply doesn't matter, since the white player is dumping tons of bodies on the board starting T5+. A similar question arises at seeing 9 3-drop black creatures, and 10 3-drop green creatures; that's quite a lot! And when you look at it from a color pair standpoint: the deck is going to have up to 19 3-drop creatures to choose from. That's going to have a negative impact on their curve, and it's going to, again, push some of your weaker options out of decks entirely.
There's also some stray cards in this list that seem set to ruin someone's day; Bane of Progress is either an outrageous hoser or unplayable, Epic Proportions steals games in a really un-fun way (imho) at this kind of loose power level, Winds of Rath is potentially super unfun to face off against, and Loxodon Warhammer is the absolute biggest game-ruiner I ever cubed - and I once cubed Treachery. You can have a loose powerband and still have fun, but these cards in particular that I've pointed out seem like they're set to spoil the fun entirely, and I can't imagine a playgroup that's at this casual a level finding them enjoyable - but YMMV.
I feel like there's maybe more creatures than their should be personally, and blue in particular looks somewhat anemic. As someone who really loves spell-based strategies in Planeswalker-less (or Planeswalker-lite) cubes, this is a bit of a let-down to me, but it's up to you and your playerbase what you like best.
Blimey, RaBM - thank you so much, that's super helpful. Let me try and assess, sort out the mistakes you've correctly spotted, and I'll do a proper write up when I'm done (and update the front page...)