So a few things that need to be changed:
-Earth Tower shots shaking the whole screen
-That awful sound when you don't have enough money
-The tower encyclopedia is apparently glitched and gives no information passed basic towers
-The Sand tower that gains damage per kill doesn't have any counter or indicator of how much bonus damage it has so you have no idea
-The magnet tower is pretty OP, this combined with Glass Towers seems to be an easily dominate strategy that wins any map.
-Hotkeys for spells would be nice
-A speed up button would be nice
-The ability to click on an enemy and see its remaining health and other information would be nice
-A table of information about monster weaknesses or tower strengths would be nice
Overall it's a very visually appealing game with a good design concept and a lot of work put into it, but it's not a fully polished game. 3/5