Awesome work! Very cool and high quality production. Great use of the theme.

• The initial load and main menu feel very professional.
• The story with the characters talking is very well done. The script could be edited down a little bit.
• You could change out the music when the cutscene happens. Like when your master dies, the music from the main menu would have been a better choice 
• It would streamline the game if the player gets to Level up at the end of each segment. No need to level up mid combat. This is also a psychological trick to entice the player to play the next level right after they level up.
• The gameplay was pretty cool and unique but maybe a bit too fast, I had trouble understanding what was going on.
• After game over I accidently clicked through too fast! It would be really nice if it saved the players progress to continue where they left off.

This game is hella cool, I didn't know LittleJS was capable of this, wow.  You might want to map the close power up menu command to a different key, because ESC key interferes with the fullscreen toggle, at least for me.

Combat feels so good. Spinning attack and leveling up system in well executed.

Great game, the combat combo system is super fluid and I really like the text elements and upgrades. The UI and scenes are super well implemented. however I ran into some game breaking issues on my machine. I noticed the game takes a long time to load on my laptop, upwards of 2 minutes. Stage 2 tanks the FPS with so many particles on screen. Sprites don't load in at all like the example screenshots. Here's a dump of the logs and here is a screenshot of what I'm talking about: 

CPU: Intel i5-10300H (8) @ 2.500GHz 
GPU: NVIDIA GeForce GTX 1650 Ti Mobile 
Browser: Firefox 140.3.1esr (64-bit) Linux