This game really makes you feel like your going donkey mode.
This game is a delightful little platformer with some rough around the edges movement (movement is hard, I completely understand)
Starting the player in the barn is a good way to teach them the importance of the dash mechanic. I really like it when the boxes fly off, its a really nice animation.
The first time I saw the toad I laughed really hard that it was just the donkey but green (this is ofcourse in a good way). The toads jump is interesting to mix with the dash of the donkey. You actively have to think about the cooldown between the toad and donkey so you can pull off this more advanced mechanic.
I never really used the frogs tongue. Its not necessary to use in any level and the one time I used it I got stuck in a wall. I do think you tried really hard to make it work and I give you props for that.
All the levels had their own artstyle, which gives me motivation to keep going and explore the levels. Level 3 even began having a bit of a new mechanic in small platform parkour in the sky. You even had a secret exit in that level (I won't spoil it) which was fun to find.
The ending was also fun, reaches the big barn in the sky giving you some more unique architecture at the end of the game.
I didn't really mention it yet, but the controls feel really good and responsive to use. This is really the most important part of a platformer, you really nailed that part.
I now know how it feels to go donkey mode, thank you for this experience!