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Daily Challenge is my favorite mode. I like missions limited to a small number of tower types. These missions help the player to learn using tower types which are not their favorite ones, and maybe they think they are completely useless.
Generally, I like all kinds of support towers as they can significantly promote the effect of other towers if used well. I like Monkey Beacons/Monkey Villages and especially Banana Farms. If the player has a great income of money from Banana Farms, they don't need to care about money and they can build as many towers as they want.
Special Abilities is another of my favorite features. Basically, I like all monkey-making abilities.
Also, I like the concept of Heroes, i.e. towers that are upgraded automatically over time and that can become very powerful without spending any additional cash on them.
And a few words in my native language:
Ahoj, pokud by se tu náhodou vyskytnul nějaký krajan, můžete mi napsat i ve svém rodném jazyce. Pokud budete potřebovat s čímkoliv poradit, jsem vám tu k dispozici, případně mě můžete jen tak pozdravit a pokecat si se mnou na mojí zdi.