Coolibert take on Pico! I see a lot of potential in this!
Since its a demo, I still have some thoughts and ideas;
The artstyle is looking great so far, specially on the complete illustrations of the characters as they talked; I also have to mention a surprisingly great distortion effect after the first fight with Cassandra.
I like how you took the aim for a boss-rush-oriented sidescroller. which left me wanting to see some more variety in the scenarios, specially considering the good mobility you can get from the Dash; Maybe some fights could include different kinds of platforms and interaction with the scenery and objects.
I found the boss battles to be for the most part pretty diverse and inventive by themselves, but they also left me hoping for a final phase on each boss which could include all of its attacks in a sequence of some sort as a 'final test'.
I also agree with the need for a command to 'aim still' at the enemy, since sometimes you don't want to move out of a safe spot.
Well, that's what I have for now; looking forward to future versions!
(this is completely unrelated; but I may have recognized a few Chrono Trigger sounds at the menu screen...Maybe?)