What i don't get is how you should spend your points when you are going back to the earlier levels and the upgrades are not working, magic towers will not slow, you don't get the spear men etc, are those points just then wasted? how do we know what is wasted an what is not?
Some upgrades are not allowed on the challenges. Check the stage challenge description: take a look at this picture: http://www.ironhidegames.com/max_upgrades.jpg
I think what is so good about this game is that it is relatively hard without being frustrating, quite a difficult thing to achieve. Most of these kind of games are too easy. Well done.
There really is no need to put in a chance to miss at all, it lowers the skill cap of this game. Popo's 60% to hit on slingshot? fine, any move that can really hurt another character for low energy deserves a miss chance. The only argument for random missing is that it could become then a choreograph of the same moves over and over, yet this cannot happen for one simple reason, the ability to switch cards. Get rid of the misses, it makes this game a joke.
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Some upgrades are not allowed on the challenges. Check the stage challenge description: take a look at this picture: http://www.ironhidegames.com/max_upgrades.jpg