kkhh: in the final tower there is a large window looking at the space and the Earth. after a few seconds a hedgehog flows in... watch, what will happen to it! :)
very good idea, and good presentation! very fun game, I gave 5/5, but a sequel could have some changes:
+ longer gameplay with more upgrades and challenges (gameplay is long here, but gets boring very soon)
+ pause button
+ statistics (headshots, psy-kills, etc.)
- link at bottom of screen
keep up the good work, I'm waiting a sequel! :)