After quite a few attempts on the last boss I finally triumphed only to be met with... the level select screen. I was hoping for some sort of ending or something for all that hard work grinding levels to max out the ship then finally destroying the final guy! :( I say 4/5 for that fairly anti-climatic ending.
A save option would be a good idea but it would make the game a bit too easy. If you are going to add a save feature (which would be awesome), maybe add more floors and even a bit of story to make it more intriguing.
I was having some fun until the blocks started to clip into each other. At that moment it was impossible to continue. As I try to pull the blocks apart they start shaking uncontrollably. I give this game a 4/5 and it most definitely will get that 5th and final star from me if that bug can be worked out :)
The hit chance is ridiculous for the defense quests. It gets fairly annoying to be missing the same target five times in a row only to let two others pass by (and also miss them when trying to get them).