I like how you got the theme into your game. Some hints at the start on what to do and what the controls are would be good. But I found it out and think the idea is good.
It's not good, because I did not get to do everything I wanted. Planned was an upgrade system for the Tower, to upgrade bullet amount, turn speed, health, more guns and other weapons (ultimate weapon should have been a flaming sword to mow the monsters with and for the theme), more different monsters and christmas presents that the monsters want to destroy, that you need to protect, too.
A further view area would also be a good idea, yes.
I played it the 2nd time now. The first time I did not like. It was because I played in usual itch window. With a small window you can not get enough speed to make some of the levels (like breaking the ice wall was impossible), since you can not draw the mouse far enough.
On fullscreen it works well and looks also better. It's same problem as DeltaVs game. Better write it big on the game page, to best play it in fullscreen.
Music and style fit well together. Cruising around the little planet is cool. Had me think of The Little Prince driving around on his planet. Maybe add some baobab trees. The turning mechanic is also cool.
This is a feature! You can only turn in one direction or stop, not go back. It should make it a bit more of a challange.
I planned to add more guns (and a flaming sword on one side) to the other sides with updates, to make it easier, while enemies come in faster and stronger. But did not get this far.
Sometimes I had the feeling, some of the guards were changing between the levels when I was tansiting fast from the crystal level up. Not sure if this is intended?
I would also recommend usind a,d or arrow keys in this, it's too hard to control the paddle. The mouse goes often out of the window and then the control is weird. But good idea with the extra features to the classic breakout game!
I like it. Only at the beginning with the arrows, I think you get stuck for a bit too long, where you can not do anything. Maybe make this waiting time shorter?
