This is my favorite game I've played so far! Trying out the different units to try and find synergies is really fun. And I love all the different sounds each unit makes on activation. That's a very cute little touch. I could see myself sinking a ton of hours into this if it was a fully fleshed out game! Although as it is right now it needs a lot of balance work, which is completely understandable given this is a game jam.
I found that the game was unloseable if I followed the same strategy every time:
Buy as many receivers as possible each shop -> Buy the first sunflower you see -> Make big spiral chains with the sunflower at the end to farm money -> Keep buying receivers (you can buy something else too once it's much cheaper to increase chain) -> Buy a turbine / pinwheel -> Go infinite.
I'll attach an image of the infinite setup I had, which is pretty much the money farming setup too, just replace the end with a sunflower. I really like the fact you can go infinite, I think it makes the game really compelling. However, it isn't super engaging once you figure this out, because you can always go infinite the same way every time. I think this game would benefit greatly from some mechanics to mix it up so you have to adapt on the fly during each run. Since building the same spiral each round was effective, but it wasn't the most fun thing ever once I had it figured out. For example, you can go infinite in Slay the Spire, but your deck being shuffled and there being different types of enemies on each floor ensures you need to adapt per round to getting the infinite going.
But with all that aside, I still had a wonderful time puzzling through the mechanics. Great work guys :)