I have a suggestion. Making hotkeys. Add some blank cells somewhere(actually there's huge empty black space), each cell signs small number. (maybe 1~9) Player can drag buildings they want on that blank, so they can chose buildings with numbers. Like if you want this. (sell hotkey would be also great)
Shield has no benefit. Dagger is a lot better shield only exnteds the battle by tanking. when 'the holy' monster comes up, it's a lot better to take some damage or die fast than damaging less than 10. shield should have some speical ability such as stunning(skill).
i have no idea how to complete the 21th? round. (which is composed of 3pieces of room and there's a big jump between twe floors. one piece looks like roof and seems useless. can you give me a tip?(message)
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