Thanks for the feedback / playing the game :)
The vertical tearing on the tilemap has been fixed with a post release update, quite an easy fix in unity i just didn't have the time to do it before release (had a long list of implements i wanted to put in haha)
I've updated the following to make it a bit easier:
I made enemies you can't "magician" blue. So slimes and a plant can't be turned into cards.
Redy / orange versions can't be turned into a tower
The Boss is blue, but that's an exception, he requires different card types to completely damage and defeat him
The water drop has been fixed of cheese, they were last minute additions after i threw in the checkpoints. but it's a bit dirty on the first drop, the slimes are now lower in the water and if the player "drops" without keys it should take a while to sink in to take damage.
Hope these changes "help" but we'll see. It's still a long way away from the finished product i envisioned but im happy with the different mechanics