Here are my thoughts about the game:
- Level one was unbeatable. You would take damage on each cactus so you'd die no matter what.
- The art is a bit all over the place. I would suggest you pick a theme and make every asset fitted in the theme. (if you pick blocks, everything is a block. If you pick dinasours, make a dino environment, character and primitive exotic plant.)
I can see it being a good concept, but it was too unplayable to properly test it out. You should play the game yourself regularly while developing. If a new game is insanely difficult, most of the players just instantly give up and maybe that makes the miss out on nice things you implemented in the later part of the game.