I kept losing lives even when i didn't hit anything, also i saw no purpose of switching colors.

The art is delightful. You have a knack for pixel art. The gameplay, maybe because of a lack of explanation, was hard to understand. I'd love to see how the game was intended to be played, because I loved what I saw.

Hi, nice game! 

Overall, I'd say that it's pretty decent especially since this is your first game (I think). 

Gameplay - It could do with some improvements. Mainly giving the player slightly more room to jump and play around with the dash mechanic. Speaking of the dash mechanic, I really liked it. It's a neat idea and was executed well, so no criticism there. 

Art - In terms of art, this game definitely succeeds. The BG art looks amazing and the players and enemies all look really good. 

Music - The music bops but is a bit loud. Sure, you can just turn it down on your own machine, but a volume slider wouldn't hurt either.

Theme - The game definitely fits the theme well.

Hi!

Your game has some good approaches, but here's what bothers me.

I would have made the platforms "OneWay Platforms". That is, you can jump through from below and not from above.

Also, it's annoying when you get stuck on the platforms.

Both can be easily done in Unity with the "Platform Effector 2D".

I think the goal is to stay alive as long as possible. However, this is not particularly difficult, since you can simply stand on some platforms and permanently get your HP refilled.

Here I would have wished for something more. For example, that after a red ball you can only be hit by a blue one and vice versa.

Sounds like a lot of criticism, but that doesn't mean I think your game sucks. It just has some weak points which hopefully you can improve in your next games.