Thanks for making and submitting this.
What worked for me: the background music and sound effects are good. The coins look really good and are the visual highlight of the game.
Four specific things I noticed during my playthrough, listed so they're easy to work through one at a time:
- The timer displays mirrored: the minutes and seconds appear switched. Probably a small display-formatting fix.
- Performance: the game stuttered during my playthrough. Unreal is a powerful engine, but for a 2D platformer, a 2D-focused engine (Godot or GameMaker, for example) would likely run smoother and give you less overhead to manage.
- Platform edge contrast: I couldn't reliably tell where a platform ended and the gap began. A brighter edge color or a simple outline along platform tops would solve it. Contrast is your friend in a platformer.
- Head clearance: some jumps had very little room above the character, so jumps that felt correct still hit the ceiling. A bit more vertical space in those spots would make movement feel fairer.
All four of these are fixable, and the audio and coin art show real care. I hope you keep building on it.