Short-Lived Fun
Invasion 3 is quite cool. The first 3 stages kept me entertained, but as it wore on to the levels 7~9... I started getting bored. It was repetitive gameplay, and all I had to resort to was Upgrading Archers and sending them en masse. 80 of them could take down a level 9 castle in 20 seconds. Tops! The enemy castles were also predictable. Each level you complete, the computer shoots more arrows. You could improve on this game by actually having the computer send troops at you or have your own castle to defend.
Overall 7/10. Try to keep the gameplay fresh and not repetitive. Good Job.