Great graphics and the combat works very well!
I managed to reach the porcupine after the cave.
I loved the colorful moving text, it made it more fun to read.
I liked the idea of carrying items, but I don't know if that part was implemented; it seems like it wasn't. But the idea is quite different.
There are plenty of checkpoints, which is great and avoids frustration.
The attack sound is very loud; it even scared my cats, haha.
More air control would improve the platforming, the character keeps a lot of momentum after the jump.
The biggest problem for me was the fact that the little mouse dies instantly when it touches the thorns, and there are many thorns that are difficult to dodge. Since the character has a health bar, it would be better if it lost health and remained invulnerable for half a second to give time to get out of the thorn. Its constant death on the thorns was the most frustrating thing in the game and prevented me from getting very far.
The character falls at a very high speed; it's not a problem, but in some sections it makes it difficult.
Right at the beginning there's a hole with spikes, it's impossible to see where the character will land before jumping (despite having a function to look down, but it's not easy to do that while moving quickly across the platforms because the blocks break so fast).
The blocks that break are very fast (very very fast), I only managed to get past the beginning of the cave part after memorizing the path. They also break if you bump into them from the side or underneath, which happens quite often and unintentionally.
It could have variable jump speed (halving the speed when releasing the jump button). In some parts with spikes on the ceiling, this is quite detrimental.
Going to the left at the beginning of the game, the map is incomplete.
Pressing down scrolls the screen down, but it never returns to its original position.
The character get stuck in this wall after some deaths: