Something that made it very difficult to recognize the buttons on the game were the "greyed out" locked abilities of the Giants are too dark, it's hard to see the symbol underneath (This was incredibly difficult for figuring out different aspects and strategies and stuff.
Perhaps instead of having the lock on top of the button, have it just below the button. Kinda where the "level" of the button would be, but be instead a little, tiny lock symbol. That way it's clear that the ability is unusable, but we can see what it is.
Thanks <3