Nice approach to the theme for the jam! The only issue I had was that sometimes while moving the cubes wouldn't jump and I would run into obstacles (could have been my computer, not sure), but overall nice platformer!

Great use of color and overall nice and simple art style. Only grip I have with the game is sometimes I'm not able to see whats going on for the red character cuz the camera follows the blue guy

It would be nice if the camera was locked on the y axis because when you jump you stop being able to see the ground.

It was fun to play. Liked level desing! Time to time it felt like the jump was a bit unresponsive however, I enjoyed the playthrough! Good job.

I really like the game design. Good idea, playing with 2 characters with 1 controller. Who controlling the player felt weird. I wish the controller was a little more precise.

Simple but effective concept! I think it would be better if the items you had to avoid looked a little more dangerous, so you are more aware of them. But good level design!

This was TimDev's idea, right ?

Very simple concept but the double jump could be used more I feel like. Honestly for a one-dev game, it's pretty nice! 

Overall, there are a few things that I think could make the whole experience way better without too much work (try them on your next game and tell us how it went): 

- The game is themed around two-colored  worlds, but both the enemies and platforms are in the background's color. Maybe make every platform blue in the blue world, but the enemies in blue world are red. Some enemies are spikes, some are circles, and there are at least 3 shades of red used for enemies making the whole thing not very recognizable.

- The placement of the whole scene is a bit weird: we don't see the sky part of the blue world when not jumping, but when jumping the red floor is completely hidden and I landed on enemies/empty spaces I didn't know existed. To fix this it might be wise to have the camera be a bit less zoomed and fixed in place? or moving in another way I don't know. Also it's very easy to have a square out of the screen, and basically lose the level like that.

- The enemies could have cleared trajectories, maybe dotted circles showing their start and end positions with dotted lines in between? It's a detail though.

- There is a bug that I haven't seen mentioned in the comments before me: If the red cube picks up a diamond before the blue one, it sometimes locks itself in place: the blue one could go forward but not the red one.

- Something to quickly restart the game might be helpful, maybe pressing on the R key reloads the scene? Or add a pause menu, that could be nice too.

All in all, the idea is cool, some misc changes would improve the experience greatly.
Congrats on your submission, and good luck for next times!

Cool design game. Jump button need to improve. Maybe use GetKey (not GetKeyDown) or use in Update

Nice Game But UI Could be Better 

Neat level design. Controls are bit unresponsive at times.

Was frustrating that the jump input got lost sometimes, but I liked the art and the level design.

I liked your level designs! The movement was weird, though. What I mean is that sometimes pressing a key would do nothing. This happened randomly though so I don't know what the cause would've been.

Your controls are a little jank, but I liked the gameplay. The music got repetitive quick.

Your scene transitions are abrupt, maybe add a fade to make them less jarring