I might be terrible at this game, but I never saw any upgrades. I actually liked the acorns and having to think about your timing, but it was unclear to me how to attack initially. It seemed to be based on proximity to enemies rather than time based, so it was difficult to gauge and control. I thought the plant sprites were adorable, but the checkerboard background took me out of immersion a bit.
Viewing post in Reap Hoard You Sow jam comments
Only upgrades currently present in game are from level-up (blue bar under health bar)
Weapon auto-attack is based on enemies present within attack range. I agree that it’s not intuitive, but it was designed that way, since initially there was ranged weapon option planned.
Glad you liked sprites, it was my first real-ish experience with pixel art. As for background, it’s not perfect, but I prefer it over flat color. In ideal world, I would prefer to have some kind of objects laying here and there to visually anchor player’s position in arena.
And thanks for your review :D