I'm not sure what I'm supposed to do here, even after reading the controls (Also never give a sheet of controls like that to a player, they will never remember all of it)

i think i misunderstood the idea, was playing only with magenta, maybe a tutorial o some little clues can help

Same thing..... the controls were a bit hard. didnt manage to merge.. I played with the magenta square and shoot and run all the game lol.. Very interesting idea. Also, for the swap, you dont need two different buttons, that would make it easier and more intuitive. But good job!

If you have time, check out my game, i also have a split and merge mechanic

https://itch.io/jam/brackeys-5/rate/927925

I sadly couldn't get a hang of the controlls and therefore pretty much played with only one character

I had difficulty with controls but nice idea.

Summary

Honestly, I had no clue what was going on, it was way too confusing and I basically rage quit after three tries.

What I liked:

• Because of the confusion and rage quit, I sadly couldn't find anything I particularly liked

What I didn't like:

• No tutorial
• No music
• No sound fx
• The controls were on one page, but it was a confusing layout. 
• No clue what the UI was telling me
• Art was too simplistic

So-So:

• I couldn't find the theme connection due to not being able to play it the way you had intended it to be played, but looking at the screenshots and "merge" (although I couldn't merge at any time, I tried), seems to suggest that there's some connection going on.

Closing:

IMHO, a proper tutorial would have served you the best here. No music/sound fx, that's ok (not fine, but if the rest was great, it may be overlooked slightly), not everyone can get that in or source it, and not everyone's a great artist, but when the gameplay is so frustrating that no one has a clue how to play it, that's where a lot of issues start to unravel. 

The game was a bit confusing, as the left click would not trigger the firing, but the pink block automatically did. It needs a bit more work on making it so that people know what they are doing, like a tutorial. Other than, good stuff!

Ok... Could use a lot of work. I didn't have much fun playing, because I didn't know what was going on. The graphics could use a lot more to them. some music and SFX would be nice. You desperately need a tutorial. Could be more Intuitive, but with a lot of work could be a great game.

I had no clue what I was doing in parts. A tutorial would help give a better understanding of the objective here

It was a fun concept....Has potential to become better.....will check it out later!!!!!

I hope you will add some music by then as this game with music will be so better.....!!!!

I like the concept but i think that its too easy