Is everything supposed to look like it's going in slow motion?
Okay, I played through on a different (much older!) computer, and it ran fine.
Notes:
* It's a fun style for a game!
* The game itself is pretty vanilla, though, and the level you've done so far doesn't seem to reward exploration much, so it's kind of a slog.
* I'm pretty sure I've fought that boss pattern quite a few times before?
* The text during conversations seems to clash stylistically with the super-large pixel style of most of the graphics.
* The explosion animations are nice
* I didn't realize I could double jump for a while; perhaps putting the player in a situation where they're forced to double jump right away would ensure people know about the ability from the start.
* Overall the game didn't seem too hard to me, though the really fast guys who rush on to the screen definitely feel unfair when they hit.
* As the game gets longer, some explicit way to save will be nice.
Overall I wonder if there isn't something more you can do with the number theme of the game ... the visual style is original and interesting, and the rest of the game doesn't seem to hold up well next to that.