Mini Tower Defense

Build weapons and barriers freely to construct your unbeatable tower defense. Without fixed map, unlimited waves.
The monsters move from start point at top left corner, advance to end point at bottom right corner. You need to build barriers and weapons to bar the way of monsters and destroy them. If monsters passed end point, lives value will be subtracted, when the lives value reach 0 game over.
This is a game originate from oldj's blog, it is simple but very attractive.