"Alright, this may seem horribly gross, but the only thing I can do is to drink this camel's piss. Not only will it gross out anyone at home, it tastes way nastier than human piss. It is also a great source of mana regeneration!"
2/5: it seems the angle of which the shots go off the shield are randomized. I got bored on the second level, seeing as how simple this game is. Also, there are practically no upgrades which would lead to a short game overall.
Personally, I think all the "emotion" in this game is mostly placebo effect from Weir's fans. Sure, it's a bit deep and cool; but since it's barely considered an interactive video, it can't have as much as value as his other games. 3/5
"Note about persistent upgrades:
It is more like tower defense style – you have to build and upgrade from scratch from the beginning of every mission. So you can replay any mission to try another upgrade strategy and reach more rating/score. If you will return to replay mission 2 after upgraded for mission 5, you will destroy all in a second."
A lot of people aren't reading this. As for what I have to say to this, you should start with the total raw energy you have racked up in the game WHEN YOU GOT TO THAT LEVEL.
The first time I broke through the final door was epic. I had just depleted another rocket so I was basically at full speed AND above the clouds. I hit the middle of the wall at full speed and with a sweet impact.