Shame that you didn't playtest the browser version (I only play browser games in game jams). It looked cool and I'm sad that I didn't get a chance to start the game and play. 

Note: Technically the cartoony font wasn't made by me (I found it on google fonts), but the game's primary pixel font was designed by me.

The game is REALLY short, but I know it's hard to make a game in such little time.

The art and music were great, hope you update it!

I figured out the controllers but you may write the controls in the description. Also, the only text was "error" for me like you mentioned but I think it wasn't bad :D I even thought it was a decision choice. If the game had glitchy effects as an aesthetic it would be cool. 

Platforming feels very good and particle effects are great. It's a shame after the tutorial there is no actual levels. Music is also a very big plus. Even if you won't consider creating the full game, I think that just filling in a few levels to be able to jump around, shoot and dash (even without any big plot elements) could be a lot of fun. For the jam it is great.

For smoothness I'd also suggest making the slash animation faster (if not instant) as the fact that player character stops to attack feels a little clanky.