3.5
the merge system and ability to change tower placement freely makes for more engaging Gameplay and there's plethora of gamemodes to choose from
game also did fantastic job by having a sweeping function for completed stages since TD games are infamous for how long their stages take
only issue i had is with game audio breaking when i log in with my account(guest one if it's important) which made me play without audio entire time
i left that category empty for that reason, feel free to try it out it's a great TD pick!