Really interesting submission, and one with really solid graphics and polish The pixel art especially is great, and I like your title and page design generally.
It took me reading other comments to go back and realize I could progress the game more, as it wasn't immediately clear to me what I could afford on the skill tree, or where my own gold and mana were recorded.
I agree with other comments that ultimately I think the inclusion of a skill tree and save load system seem superfluous systems for a 9 day development time, and I think that time might have been better spent on improving the core gameplay and creating a more satisfying core loop. At the moment, the actual task feels repetitive, and I can't seem to get any other items than cherry and ice. Having the option to rotate pieces, or seeing on screen when a placement gets me a bonus with a juicy effect or anything like that.
Otherwise I think the skilltree could have done with just a little tutorialization, by drawing attention to the first upgrades with a pulsing animation or similar. Or generally a simple tutorial might have helped me better understand my goal in placing pieces down.
Nice work, hope you keep polishing the gameplay! It played smoothly and without bugs and there's a lot here that could easily be evolved.