The game that got a lot of people into the tower defense genre. I first ever tried it back in the day on my iPhone. But left it due to the microtransactions. But playing it on my Steam deck it felt right at home with no microtransactions and mouse support. The mouse helped quick sections be made mid tower battles. For such a simple genre each tower and troop as much depth and strategy necessary to master to be able to play on higher difficulties. And the art style keeps you wanting to see what the next level/map looks like.