Nice entry! I like the controls, they're very different from my game (also a tile-based 2D platformer made in Godot) but feel quite good. I was able to win with 9 seeds, the 3rd level was a very sudden ramp-up in difficulty and definitely surprised me!
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I agree, the level design is very lacking unfortunately. I would've liked to add a few more levels inbetween. The idea of the seedlings themselves was actually to act as a learning curve but I think I could've done that in a better way. Thanks for checking it out! Also, I'm glad you recognized that they're seedlings despite me not managing to add any text or animation to clarify what they are.