Yes!! This is great! The platforming is fun by itself, and the gameplay loop is easy to understand. Adding a few enemies, specially to the daylight section will improve the experience for sure. You can just wait out the daylight part if you find the seed fast so there isn't much challenge. However, it's really great that you have the main gameplay loop sorted out.
Right now, you can get lucky and get an Araçá seed without much effort from your side. Even planting one Juçara might do the trick.I suppose you can either make fixed spawn points or have the random spawn points be higher. I would make the daylight part be "taller" and the night part be really submerged. This way the location of Araçá seeds will make the player explore and use two or more of the Juçara seeds. What you want is that the player not being able to locate the Araçá easily without using the Juçara platforms. A bigger and more submerged night place might requiere for you to increase the timer, but I think a lot of this comes back to playtesting and iteration.
Valeu e abraços from Argentina! I'm looking forward your next releases.