This is the first flash game that I have played religiously for a long, long time.
The only things I'd like to see are:
1) Reset skills button
2) Some tower upgrade / skill that lets towers attack invisible Ninjas.
3) Nerfing Ninjas, making it so once they have a gem they cannot stay invisible
Not a very good game in my opinion, must have been one of their early games. No matter how much upgrades I bought I don't notice any difference at all.
First complaint, Not having an opinion to turn down the graphical quality.
Second complaint, having to hold down the speed up button, as opposed to simply being able to click it on or off.
Last, having a Kred screen pop up every time I click something. No, I will not pay money to unlock stuff in a FREE game, thank you.
At the start, the game can be quite frustrating, getting robbed by thiefs and encountering constant battles when your low on money and weak. Once you, however arm yourself well and purchase a better vessel, the game picks up nicely.