This game is actually really close to being perfect, but:
- UI absolutely breaks when things get crazy. My game actually crashed
- Hovering over every coin becomes unmanageable with a lot of plants. Add a hopper plant or permanent coin-pickup ability
- Coins/Seeds/XP mechanics should be explained in the beginning.
- Boss Slayer plant should be locked behind a certain level and maybe require a mix of coins AND seeds? Being able to "unlock" a new plant would feel very exciting and rewarding