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Good game. The placement slots seem a little off and the map and the placement around the edges seems a bit odd (half guns on the left, but a big empty strip at the bottom).
Needs a bit of work on the balance, as it's to easy (just build a lot of mines and fill the map with big guns). You could make the foes escalatingly tougher and make the guns upgradeable. Limiting placement to just, say, the bottom half of the map might help as well (although it might also make it more boring as I'll have even less to do for the 30 seconds or so it takes for the next wave to arrive).
Ended on level 25 with 2 rows of mines, the rest of the map full of big guns and 5-6k in the bank (nothing to do with it). Sent a tad under 40k in total.
Some aircraft and anti-aircraft guns might help matters. If they are able to bomb the head quarters, you'll need a way to finance repairs for it (possibly automatically, as a penalty for getting it damaged).
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worst flaw in this game is that the cannons rarely hit the targets while they're approaching the base, making the long range turrets almost useless, if you wanted to kill the enemy BEFORE they got into range.
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Generic TD game. Becomes trivial after about level 10 or so, just put big guns everywhere. Needs upgrades, different enemies that are vulnerable to different things etc at a minimum.
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lol, playin on easy and my screen is full of the best turrets and i get enough from all my mines to buy another every single second.
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Really good game, but if you are gunna make a sequel or update i would recomend adding different technology levels so like you pay 10000$ you get more turrets choices, also i would recomend making bigger maps.