[2012-2016] [PC] - Old puzzle game involving a red triangle.

I have very clear memories of playing a certain puzzle game on coolmathgames where you were a red triangle trying to solve puzzles. I'm like 90% certain it's called "Red Thief", though I literally cannot find any mention of it anywhere on the Internet. It was a strategic game, and I think there were limited moves to be made as well as enemies you had to avoid (they were also shapes, like circles). Hopefully someone remembers what I'm talking about because I've been trying to find it again for literal years to no avail.