Gave the demo a try!
Some observations:
- The game doesn't seem to use the mouse. Maybe hide the mouse cursor while the window is active.
- It would be nice if the game showed the How to play / controls screen/esc menu on your first run
- Some of the obstacles seem much larger than they visually appear. Darkening the tiles beneath obstacles so that it's clear what's walkable and what isn't might help the player better judge distance.
- Font on score screen is really hard to read
- Jellyfish can spawn on the player
- Anchor making the player slower until they pick up sushi feels kinda' rough, maybe time limit on that
- It is very unclear at first whether or not the shrimp gun has X shots or X time. Maybe add countdown
- Unclear if any of the enemies do anything differently
- Auto pause on window focus lost would be cool
- Can only punch 1 jellyfish at a time even if they are stacked
- Sparkling pearl quits flashing after one animation cycle. Not sure if intended
- It'd be cool if pearls that were obscured by powerups could be shown as transparent silhouettes above the powerup
- Fish enemies can walk offscreen using the bridge
- Extra life at 1,000,000 points would be neat
- Warp tunnel idea is cool
- Not sure how to exit the game
Ended up with a high score of 1276350