Fun game and I like the concept of shooting a bunch of mushrooms. Only thing that I can negatively is that the bosses are too hard. Either their attacks are extremely difficult to avoid, or in the case of the 2nd to last boss (the steel mushroom) his main attack is near impossible to avoid. Otherwise, challenging and fun game, keep it up.
This reminds me of Pixel Knight
Playing as the zombie or the fat guy was pretty ruthless especially with some of those blue mushrooms which actually go faster than them (so you can't outrun them) or the zippiness of many of the bosses. Last boss is particularly unfair with those two as you must take damage (at least I don't see any way to dodge the 8-way attack with those two) so if you're unlucky with hearts and shields, game over.
Much of the game around the point of the hopping mushrooms and beyond revolves around getting lucky with shields.
Sometimes it could get really frustrating if you had your luck maxed out, destroying tons of chests and yet no heart or shield (because you just got unlucky) even after breaking more than 15 of them and so you die at a boss.
I had a lot of fun killing all those annoying mushrooms, even though it was a little bit repetitive. The different endings are quite entertaining and you had me at the ending of Notch and Terry!
The only thing that surprised me was my story board highscore... my highes score was something about 390k but it somehow turned into that ridiculously humongous 1 billion. If it can be somehow fixed, it would be great.