Great game! The art is nice, cute and cohesive, but the best part is the gameplay and how much content you managed to put into it. The main mechanic is nice and well executed: The levels are well thought, and there's some constant progression in the game. While I disliked that getting killed by a slime late in a level sends you back to the beginning, the game was balanced enough to not make this frustrating. The addition of the plants-vs-zombies lookalike plant, but with a gun, was an unexpected funny touch. There was a point however, where I tried to reach some platform by bouncing on two spring plants back and forth. I'm not sure if I just didn't execute it properly, or the game just didn't allow it, it was not clear.
The core game mechanic also reminded me of a level in Spyro where you had to plant either bouncy mushroom or a platform daisy, to reach the top of some tower. Not sure if you got inspiration from that :)
Overall this felt more like a small completed game than a jam entry. I had fun playing it. Congratulations!