This was a lot of fun! Controls very smooth and the battle was intense. I like that there are multiple phases to the battle. I just wish the game was a bit longer.

 For example it would be nice, if you could fight the boss again after beating him, but the difficulty keeps increasing. For example with each battle the enemy bullets could to more damage or move faster. Anyways, well done!

Very fun and 

the art is so good i thought you did not use the palette

Really fun, cool, and challenging game! Well done

Noice one

Didn't kill the boss, I will 100% be back and retry.
Nice game, I would love to see more platform or item to help me?
Anyway, nice job for a solo dev in 72hours.

I do enjoy a good boss battle. I was able to do a little bit of a cheesy strategy by going between the floor and the bottom floating platform to easily dodge the laser. And completely ignore the aerial bombs. Although it was fun to discover that about the AI and exploit it. It is fun seeing what kinds of games people are designing when they have no required constraint on the gameplay. Would have been cool to see more bosses. Or perhaps a second phase. Of course one can only do so much with such limited time. I really enjoyed the exclusive focus on fighting bosses in Titan Souls. So I am getting that sort of vibe from your game.

Nice use of the limited palette. Although I did find it hard to see the BOSSCAT's lil' orange bullets. Especially when they were getting mixed in with the extreme amount of particles coming out of my big ol' gun. Overall I had fun blastin'. Keep up the good work.