Castle 3 is brought to you by DR.BEES. Also those annoying little shits who climb straight into the throne room. Anyway great game. Loved the sprite-work, in-fact if there was one thing I would have wanted more of would be monster sprites, having some of the monsters take on a few more forms. Would have liked to see more of everything, actually. This is the kind of game that could have a really great sequel or remake by adding more monsters, humans, designs, etc. (although I probably won't see that happen since the game was made in 2011)

This game is entertaining, but holy shit is it laggy.

I just finished the game and it's a pretty sweet game. Keep then comin' .

My only complaints were with the towers, as other people have already said. If you could buy a level up, then you could have had many more strategies. An obvious solution would be to build your defense from the top down, but I assume that a lot of people missed this.

As for the towers themselves:
I really liked mudman, but it was too expensive and evolved rather slowly.
I disargee with LordThanatos, dragon was clearly superior to the demon, especially when leveled up, dragon has three different attacks when leveled up, and all of them deal damage: pushback, additional damage, and frost breath, which freezes the enemies solid for a couple of seconds. In addition to this, the skeleton needs to evolve 3 times in order to increase his attack power, the dragon gets it after the first level up. I suggest bulding a slime first, than a dragon and after that the artillery. :D
I also faced a dilemma with plants, when they evolve for the second time, they lose half of their range, which I really disliked, becouse my strategies were mostly with choke points.

NIce simple and fun game to play. Love the idea of beating down knights with plants.

Really original and unique ideas here, I really loved it, I'd give it 5/5 of five if there were some upgrade system, IMO its the only thing missing.