I thought this was quite fun, kept my attention for longer than I'd initially expected! It took me a while to figure out how the upgrading worked but the core task of planting and feeding carrots to the machine meant I was able to trial and error my way through in time. As others have said the controls felt a little janky sometimes as placing a carrot down where I wanted it wasn't as easy as I'd hoped, especially when it was behind a coil, and sometimes I'd pick the towers up accidentally.
I think with audio and some polish this would be a fun little game!