Pro

• Decent graphics for a Tower Defense game.
• Three difficulty levels.

Con

• Lazy, boring upgrade system that requires grinding.
• Enemy paths sometimes unclear.
• Poor targetting priorities.
• Little variety in towers and only half of them are viable.
• Crappy UI, Escape doesn't even open the menu.
• No screen resolution options, just Windowed or Full Screen.
• No keybinding option.
• Terrible 10-second music loop.
• Uninspired spells. Meteor Rain, really?
• Very little variety in maps, the same map is used for 2-3 levels.
• The publisher is so lazy the description still refers to collecting crystals like in Royal Quest.
• Tutorial text (new tower/spell/enemy) plays every time you play a level, on every difficulty.
• Adds nothing to the genre.

Conclusion

This game makes Royal Quest look inspired by comparison, and that is not a compliment. The whole thing is just lazy and uninspired, there are tons of better Tower Defense games out there, even free ones (like Cursed Treasure 2).