The art was good, did you made the assets all by yourself? There were times, were order of the assets conflicted, like the blue crystal, you can change in that sprite renderer there is order, most of the time player is top so he has the highest order. Also you should make camera to look forward, so that the player can see the enemy better. And I would suggest next time, try and make the game easier to access. WebGl is the best. but some games are too heavy for that. ;) Overall good job! ;)