Gave it a try and enjoyed it!
The music was a good choice. The heart-character looks adorable. The sorting of mails and the passwort-cracking events were novel to me in this kind of... I'd say tower defence style of game and I actually enjoyed them for their novelty :)! The Upgrade-Animations made me smile, they looked very neat. The text didn't fly by too fast and starting a new game was a quick effort, since clicking through your dialogue was so quick. Oh, and of course, the actual tower-defence-style of gameplay worked really well, too :) No strange effects, no random "everybody dies", the behaviour was clearly shown beforehand and the attackers are varied enough as well in style as in attacks.
In my opinion, there are only very few minor issues: I had a bit of a hard time finding the correct range to build stuff away from other buildings. The Upgrade and Demolish-Buttons were available sooner than the tutorial told me and I demolished a couple buildings by accident because I realized I had build my towers in the wrong direction for the next attack :D I would have liked to be able to rotate the firewalls a bit, but two buttons were good, too.
It's worth to give it a download and play it for a while :)!