Managed to open the game - just grab a copy of UnityPlayer.dll from another game or from your Unity install folder. Unfortunately the game is pretty rough. The biggest problem is that the controls are very unintuitive. If you want players to have both hands on the keyboard (pressing WASD and OP), then you can't also expect them to use the mouse (to change colours). Constantly switching between keyboard and mouse is frustrating.
I think the idea of having to manage different resources to fight different types of enemies could work - but with the mechanics being very simple, the game has to rely on everything else feeling really good! For example with some proper animations, audio, better controls, camera shake, and more intuitively teaching the player what they're supposed to do.