Interesting puzzle but the controls are not quite intuitive... The way the moment you click on a mirror it snaps on your mouse for moving or rotating makes fine tuning the mirrors more tedious than it already is. Additionally the game lacks any concrete logic for its star system - Normally puzzle games with a star system lock them behind some hard restriction, like score vs birds used in Angry Birds. But for Derrorim, you have no restrictions, you can use as many mirrors as you want, fire as many shots as you need. Since these are unlimited in use AND the basis for score, there is no reason for the player to just find the right solution, restart the level, and get the three stars by not changing anything in their strategy or procedure other than doing what they did just now, again... Whichs begs the question: Why does the score look at the start of the level to the end, rather than 

As a side note, the prims are a neat mechanic but I feel they outclass mirrors to the point you have no reason to use them once they get introduced, besides the potential risk of crashing the game.

Nice idea and a rather catchy realization! Yet the precision becomes way too tedious rather quickly - I would recommend either making a set of angles (8? 16? 32?), or adding some extra control helper (like "shift" for 45-degree rotation)? Or if you really want to stick with all the possible angles - maybe add a laser pointer? Then it won't be about shooting and waiting to see how accumulated angle errors make you miss, but rather mirror adjustment game :)

Dang this was good. I think it overstayed it's welcome by 5 levels or so, but the color mechanics were really cool. The laser physics seemed just a tiny bit off to me, so it was frustrating to get the lasers to do what I wanted. I really think this game could use an angle set or steps for rotating. But hey it's hard to make a puzzle game like this where you give the player all the ingredients and let them cook. Brave even. I might have set the kitchen on fire at one point and lagged the game out (using the glitch with getting an infinite prism loop another comment mentioned). That's not a knock on this game though, figuring out that I could do that was a treat :)