Graphics were really clean, and the music was nice, but I feel the player movement could be a bit better, maybe add momentum/sliding so that the player's movement doesn't feel so static.

It was fun.

Switching to another character while jumping was a pain.

I really like the game! I think the story has a lot of charm and I absolutely love the design of the characters. The setup for the story and gameplay concept could definitely expand into something bigger if you choose so. I could instantly pick up on the subtle differences between each brother. 

There are a few things:

• The movement of the brothers and the camera can use a bit of work. The character movement feels a bit stiff and a lot of the area becomes out of sight of the camera when you move. I think this could be improved by playing around with the speed, jump, and gravity of the brothers and maybe looking into implementing a more dynamic camera.
• Also, I didn't really figure out the functionality of the green buttons? But it might be that the things they affected were off-screen. 
• Finally, just a bug but the section with the pit has a collision in the air, so you can't fall in and can walk/float over the pit!
• Additionally, it's completely opinionated but I think that the visuals would look a bit better if you stuck with pixel art for the world/environment and not just the brothers.

Overall, I think there are things to improve (for example I would bind the switch to SHIFT instead of E, though I didn't really have any problems with the current implementation). However, I think if you wanted to make some changes and expand the gameplay (like introducing different elements for each brother, more environment assets, etc...), you could make this into something really special!

I dont like when games have a requirement to push buttons right by the movement keys while I have to move. Consider using a different key than E to shift characters.

A solid beginning, the design of the brothers was very charming and the music was relaxing. The controls are a little bit stiff and I think the blue brother moves slightly too slow, it makes switching back to him feel a bit like a punishment. But I could see this becoming a fun puzzle platformer!