I take your point but since it's effectively a Match 3 game where the speed increases over time and the number of butterfly species also increases, if you have any other ideas, please let me know.
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You have to be careful also with what seems easy as the developer might not be so easy for the player since you most likely have been playing it a lot while testing. Ah here's an idea I just thought of! In the easiest mode allow the player to hold the key to move. Then as it progressively gets harder make them start hitting the key to move. So that might be a good way to make it more difficult.