Unity Mac builds usually work nice out of the box (including this time). Couple things to be aware of:
1. Mac resolution is 2560x1600 (very high), some games that play in full-resolution (and provide no settings) lag a lot because of this. Your game works perfectly fast/smooth though.
2. Gamepad input is screwed on Mac if implemented using old Unity input system (but ok with new Input system)
As for game itself: quite nice. Some criticism:
- Well, no gamepad support
- Gamepad support aside, mouse usually has no place in platformers. It's very inconvenient and it's strange to see some game jam games do it for no particular reason (instead of just using some keyboard key). It's especially inconvenient when you actually have to move the mouse (to attack in different directions)
- There are sometimes a few "free" passages to the next screen, while only one works. It's better to "close" the wrong ones using some block so not to confuse player.
- Sometimes you die almost immediately, although it seems that game usually gives you some hurting time before making you die