Not to sound like a broken records from the reviews you've already heard, but this would be much better if there was just a little bit more interactivity. I won't harp on that too much though because it's pretty obvious that it was meant to be a passive game. Still, only a very small percent of the game I'm finding a complete lack of motivation to try and continue playing this. Even in passive games usually the achievements/medals are enough to keep me going and you kind of get that sense of accomplishment when you finally do get all of the achievements, but I just don't get it with this game.
The 8-bit style of art is nice. Maybe a little bit of animation would be nice, but it's not really necessary with the style. Even though it's nice to look at, most of the time I end of going to a different tab or even end up writing a review of this game.
With almost every character I haven't really failed by spreading the points out equally between armor, health, and damage. Perhaps I just haven't tried the key characters that doesn't work with, but it's worked every time so far and every time I start to go away from this path I end up losing and having to use a life.
I find it really odd that the speed goes down when all of the other stats go up. At first I assumed it was an error, but maybe it represents a time in between attacks? I think it would have been better if you would have just gone with the flow and made it go up like the other stats.
Overall, a little boring even for a passive game. I'm not sure what you could do to make it a bit more exciting. A small bit of animation, a cut scene, boss battles every ten levels, some voices, etc... At the end of the day I'll probably try and unlock the next character I'm currently working on, but there really isn't anything making me want to come back to finish it.