The title screen transition into the game was super clean, and I like how simple the UI felt. The checkpoints were appreciated too, definitely needed in a platformer like this.
The pixel art looks good across the board. Enemies and hazards are easy to read, and those little plant guys popping up were a nice addition. The gravity flip section caught me off guard in the best way. That's where it really started to feel unique. The main character has a lot of charm too, which makes the tougher sections feel less punishing somehow.
Platformers are hard to tune, especially in a short time frame. For a first platformer, this is pretty impressive. This is still a strong entry with cool ideas and good presentation. You've definitely got something here, would love to see you keep building on it.