Immortal Defense is available free at the Game Giveaway of the Day for the next 14 and a half hours, so if you wanted to finish the story but couldn't afford the game, go get it while you can!
Interesting marketing strategy. Is this done very often? Wouldn't it have a chance to harm the game's sales as people who were thinking of buying it now get a chance to get it full for free?
actually, friend, That website does show off multiple games, if only to give people a taste. HOWEVER, if you buy this, you cannot update it, get technical support, or anything similar. Also, if you uninstall it, that's it. you can't re-install it. So, a catch, to be sure.