I currently have the high score, but I'm sure that I'll get passed up on that eventually. For some reason when I first started I thought this game was way too hard. In fact, I tried 4-5 times and simply couldn't get pass the first level. I decided to mix it up a little and noticed you could in fact start from any level. I started at level 2, and stayed in defense mode until I had about 3-4 of the strongest ships. I then went into attack mode and just kept buying the two different best tanks back and forth. This got me past this level with little difficulty. The boss did make it through, but I had just enough to buy one more expensive tank and the cheapest one. This was enough to finish him off.
The rest of the game was super easy from there. Since you get a bunch of cash for beating the final boss and start the next level with the cash that you kept from the last level you can go ahead and buy about 10 of the toughest tanks right from the beginning. I actually even saved up enough cash sometimes to go ahead and fill my ranks with 20 of the toughest tanks right off the back. Basically it was just a waiting game until the end of the level at that point and really took no strategy past the first level.
So a few things I guess with no specific order.
It's weird that the 2nd level was kind of easier than the first level to me.
It's odd that you can just choose whatever level to start off with.
I don't know why you can just keep continuing over and over on the levels that you've already passed and continue to add to your score. The only reason I eventually lost was so I could just finish the game. Meaning anyone with enough patience can beat my high score with little effort because the game just kind of plays itself eventually. In fact, I just let the game play in the background the entire time I wrote this review.
Why can't we see what the tanks do? What's the difference between all of the tanks? When we hover our mouse over them we should be able to see what's so special about them. They need ratings like, Health, defense, attack, and speed.
If the game had been more difficult you could add more options such as mines and special abilities for every version of a tank. Some could have a strong missile attack, some a shield, some could go invisible to get better position on enemies etc...
As other reviewers have already said the screen is too small. The game is kind of unclear at first, but after reading you introduction in your description it really is a pretty simple and clear cut game. Clicking and moving tanks was difficult, but I found also useless. I never used it on any successful run of the game.
Overall, a very basic game that is way too easy once you figure out how to get past a level. Simple things such as adding ratings to the tanks so you can make decisions on what's best for each scenario instead of just assuming the top 2 most expensive tanks are the only real option you should go with.
I think you can make this into a great game eventually.