There are a lot of questions, like why do I need a hammer, why can't I skip waves, why am I always on top of the building? But the game is really nice, it's literally one of my favourite games, so I liked it! The graphics and sound are cool too! I like this part when I don't have to defend and all my turrets are doing all the work :) Well done!
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I played a bit more and I think you should balance the difficulty. So that's one thing that makes games successful and keeps players engaged - a good curve of difficulty. For example, do the hard wave every 10 waves. It will be hard to defend against it, but the player will be rewarded with a new cool turret. And maybe add a goal to keep the player engaged, because it feels like the game gets boring after 20 waves.