It's a good game, but all you have to do is hold the forward button and buy upgrades. My grandmom that have never played a online game in her life could easily played this one. It's a bit too idle for my taste.
Besides the Unity3D effect the game was quite boring. Run around, kill everything you see and collect power-up's....kind of 80's nintendo 8 bit :D
Where are the innovative upgrades, scenes, stages, worlds?