@Kirzen
if the game is truly random the probabilities/ratios that you are citing will only appear after a infinite number of games. You could flip a coin 100 times and get 100 heads but the chance that you get a tails next flip would still be 50%.
good towers currently are gatling gun, Tomahawk (build on the bottom away from worms uasaly path), Froze, Poison Gas (i dont care that they have no upgrades, use them to defend your other towers), electric shock, Flamethrowers are probably the best tower in the game, its also might be worth while to build one blizzard tower and one chain lighting.
the problem is all the other towers are pretty worthless.
you might like this game if
1: you enjoy slowing getting motion sickness
2: if you like easy/boring puzzle game with zero redeeming qualities
3: if you are the mother of games creator