This is cute ! Easy to play, peaceful and not meaning any harm, I'll definitely make my kids try it.
The goal is crystal clear. This is a really good point. You made this brown rabbit pop out to invite the player to speak with it, this start point works perfectly.
The main character moves a little too fast ; you could compare it with Zelda A Link to the Past on the SNES (I'm not particularly young ;) ).
The overworld music is nice but maybe a little sad. Not the best choice but it's pleasant to listen to, I'm still listening to it while writing this review.
On the contrary, the victory fanfare is too 8-bit and doesn't work well with the HD music.
The theme is not really followed : I don't feel anything tiny here. The human-sizes rabbits, maybe ?
Since it's your first game jam, like for me, I'll say it's a very good start. The world is well built, the goal is clear. You used good mechanics that you'll be able to apply to more complex adventure games.
Keep up the good work !