You had me at incremental :)
This is the second one I've gotten to play this jam. I like it. It's neat, plays well. At first I didn't realize I could invest more points into the nodes, since they looked greyed out after the first time buying them. I assumed getting to buy the next level would take another unlock later or something. Once I accidentally clicked one and realized it worked, it was great. Not sure how you'd have to change that to make it visually look like the buttons weren't greyed out, given the palette, but something to think of. Great job otherwise!
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Thanks for the feedback! I actually thought about this while working on the tree, but I couldn't find a solution I liked visually that still worked with the limited palette.
I ended up relying on other hints, like showing the cost and the A button when you have enough gold to buy another level. But I agree that there could probably be a more immediate way to communicate it without breaking the visual style. Definitely something worth thinking about!