Those towers with this *** mark are unlocked with coins and sorted by tower cost

Gatling Tower
Price:$5 Upgrade cost: $4
DPS: 35 - 70 - 105
Range: 2.5 spaces
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***Machinegun Tower***
Price:$8 Upgrade cost: $4
DPS: 70 - 100 - 130
Range: 2.5 spaces
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Glue Tower
Price:$10 Upgrade cost: $5
Slow: 40% - 60% - 75%
Range: 2.5 spaces
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***Ice Tower***
Price:$15 Upgrade cost: $10
Slow: 45% - 60% - 70%
Range: 1.5 spaces
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Oil Tower
Price:$20 Upgrade cost: $10
DPS: 40% - 50% - 60%
Range: 2.5 spaces
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***Polymorph Tower***
Price:$20 Upgrade cost: $10
Slow: 45% - 65% - 78%
Range: 2.5 spaces
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Missile Tower
Price:$20 Upgrade cost: $15
DPS: 75 - 150 - 225
Range: 3.5 spaces
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***Sonic Blast Tower***
Price:$25 Upgrade cost: $20
DPS: 112.5 - 225 - 337
Range: 2.5 spaces
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***Cannon Tower***
Price:$30 Upgrade cost: $25
DPS: 100 - 200 - 300
Range: all spaces
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Spark Tower
Price:$30 Upgrade cost: $20
DPS: 160 - 320 - 480
Range: 1 space
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***Slow Link Tower***
Price:$30 Upgrade cost: $20
Slow: 60% - 70% - 80%
Range: 1 space
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Hive Tower
Price:$35 Upgrade cost: $25
DPS: 126 - 252 - 380
Range: 3.5 spaces
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Laser Tower
Price:$40 Upgrade cost: $30
DPS: 125 - 250 - 450
Range: 2.5 spaces
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***Gas Tower***
Price:$40 Upgrade cost: $30
DPS: 120 - 240 - 360
Range: 2.5 spaces
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***Napalm Tower***
Price:$40 Upgrade cost: $35
DPS: 240 - 480 - 720
Range: 2.5 spaces
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***Link Tower*** (not worth money)
Price:$45 Upgrade cost: $35
DPS: 1000 - 2000 - 3000
Range: 1 space
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Flamethrower Tower
Price:$50 Upgrade cost: $40
DPS: 300 - 600 - 900
Range: 2.5 tiles
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***Plague Tower***
Price:$55 Upgrade cost: $40
DPS: 100 - 200 - 300
Range: 2.5 spaces
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Plasma Tower
Price:$60 Upgrade cost: $45
DPS: 150 - 300 - 450
Range: 3.5 spaces
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***Zap Tower***
Price:$60 Upgrade cost: $45
DPS: 450 - 600 - 750
Range: 2.5 spaces
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***Power Tower***
Price:$65 Upgrade cost: $80
DPS: N/A (increase other towers damage)
Range: 1.5 spaces
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Tesla Tower
Price:$70 Upgrade cost: $50
DPS: 700 - 1400 - 2100
Range: 2.5 spaces
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Radiation Tower
Price:$70 Upgrade cost: $55
DPS: 300 - 600 - 850
Range: 2.5 spaces
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Pyro Tower
Price:$90 Upgrade cost: $70
DPS: 366 - 733 - 1100
Range: 2.5 spaces
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***Boomkin Tower***
Price:$100 Upgrade cost: $80
DPS: 600 - 1200 - 1800
Range: 1 space
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Mine Tower
Price:$110 Upgrade cost: $80
DPS: 1500 - 3000 - 4500
Range: 1 space
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Railgun Tower (not worth money)
Price:$120 Upgrade cost: $90
DPS: 6650 - 1333 - 2000
Range: 5.5 spaces
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Nuke Tower
Price:$120 Upgrade cost: $90
DPS: 400 - 800 - 1200
Range: 3.5 spaces