One Tower (Tower Defense)

It's tower defense with only one tower!
Try to find good spots for your towers, and good upgrades to survive each wave, and try to get as far as possible!
Will you sell your towers so you can buy the best one for each wave, or will you try to upgrade one tower for as long as possible?
With only one tower, the game becomes a puzzle of resource management and logical thinking.

NOTE
Because of time restrictions, fast-forward is poorly implemented, your towers might not fire in fast-forward where they otherwise would because of rounding errors, which might just be the difference between winning and losing. Recommended you don't use fast-forward above 4x when your towers are shooting the enemy.