Need for improvements that I noticed:
1. The Start Menu especially the background and also the design, obviously you may want to create the background look seamless while looping. Buttons and title can be more interactive and the layout can do some improvement.
2. Object destruction, instead of just dropping item maybe you can some particles when a chest is destroyed.
3. Collecting coins, like add some sfx, or something that indicate that you collected some coins.
4. Casting of spell.
Bugs:
1. I notice that upon using combo there's an animation playing where it seems the player is getting hit. and the graphics become blurry or to be more specific the player.
2. The ingame parallax background
honestly there's a lot to be improve about the game. but still it's a great game and just keep going man.