Im not much of a tower defence player but i can still see the quality work put into it. My only critisism is that not being able to plant or upgrade new followers for the first 3 rounds seems redundent. It has the player watching more then playing. I don't know if thats a common thing in tower defence games but it felt off to me.
If you are interested in expanding the game, it might be a cool idea to add a shovel or item that allows players to move planted flowers before a wave. I found its easy to click a little off screen or behind the ui and accidently plant a flower out of range.
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Thank you for playing! Early game definitely needed some tweaking, but with the time that we had this seemed like the best solution for the scope we had while still trying to get that evolution feeling. If we were to continue working on this balancing the early game and adding to the late game are definitely first priority.