Not a lot to do but at least it's very well made and done properly. Some music/sound effects would give it a better atmosphere. Also, there aren't nearly enough blocks. I'll give it a 3/5...
Once you get to the sides of the screen, getting hit is inevitable. I think the hitbox for the tank should be it's cannon only, not it's entire body. Great game overall though.
@Esdrekon -- To get charcoal, there is a guy in Town (In the area with the Star teleporter) who is near the bottom of the scene. He is in the bottom right-hand corner. To get charcoal from him, you need 2 sets of colourful gems (The little bunch of multi-coloured stones you use to upgrade Natalie's Gem Staff). Hope this helped!
To all those 'Wah it reset my data fix it maaaah' read the description. It gives you a quick guide of how to NOT lose data. So stop moaning about it, that's the reason your comment is underrating threshold. Sheesh!
It was made from the free version, and I took the idea from the example and created my own version of it.