Thanks for playing! Yeah, the tool wheel is definitely clunky. I think having to select the tools at all probably isn't even needed, you could probably consolidate all the player actions into contextual actions (press and hold A to dig, tap A next to a plant to water it, etc). Then just have the menu to select seeds. I'm not sure the best way to fix the issue of placing seeds though. Maybe have it lock onto the nearest tilled tile when you have seeds out?
The difficulty is a bit all over the place too lol. It was way too easy for a while, then I fiddled with the numbers a bunch before submission. I think the spot I landed in starts off too hard and has spikes in difficulty that are a too big between waves.