I've only played a few games from the jam so far but this is by far my favourite! It's a very clever puzzle platformer with a neat GBA aesthetic that it recreates very well. The early puzzles all feel great and have their "eureka" moments, and the game's mechanics interact in very interesting and intuitive ways.
That being said, even though i liked most of the game, i think the later puzzles rely too much on execution rather than puzzle-solving, which isn't inherently a bad thing but it clashes with the fact that the earlier puzzles are more puzzle-solving than execution, which means that the early game and the late game cater to different playerbases/preferences. I also REALLY don't like the enemies that are introduced near the end of the game - they add nothing to the puzzle solving, they add nothing to the platforming, they just force you to wait a lot of the time or pressure you to throw random solutions at the wall until you beat the level by chance. They're cool for the ending but in my opinion gameplay-wise they require a complete overhaul - i really dont think that they should move independently of the player's actions!
Even though my comment elaborates more on the parts i didn't like rather than the parts i did like - i still enjoyed the game very very much. I think the game works well as it is now AND has a lot of potential if it were to be expanded upon - there's a lot of interesting mechanics you could introduce and there's still some unexplored ways to utilize the mechanics currently in the game for puzzle-making.